diff --git a/.gitignore b/.gitignore
index 14f56ef..3a8d055 100644
--- a/.gitignore
+++ b/.gitignore
@@ -19,6 +19,7 @@
 *.cache
 *.ilk
 *.log
+.vs/
 [Bb]in
 [Dd]ebug*/
 *.lib
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/CONTRIBUTING.md
diff --git a/ClosedXML/ClosedXML.csproj b/ClosedXML/ClosedXML.csproj
index ef9ef98..7de9988 100644
--- a/ClosedXML/ClosedXML.csproj
+++ b/ClosedXML/ClosedXML.csproj
@@ -46,8 +46,8 @@
     <AssemblyOriginatorKeyFile>ClosedXML.snk</AssemblyOriginatorKeyFile>
   </PropertyGroup>
   <ItemGroup>
-    <Reference Include="DocumentFormat.OpenXml, Version=0.0.1.0, Culture=neutral, PublicKeyToken=8fb06cb64d019a17, processorArchitecture=MSIL">
-      <HintPath>..\packages\DocumentFormat.OpenXml.2.7.1\lib\net45\DocumentFormat.OpenXml.dll</HintPath>
+    <Reference Include="DocumentFormat.OpenXml, Version=2.7.2.0, Culture=neutral, PublicKeyToken=8fb06cb64d019a17, processorArchitecture=MSIL">
+      <HintPath>..\packages\DocumentFormat.OpenXml.2.7.2\lib\net40\DocumentFormat.OpenXml.dll</HintPath>
       <Private>True</Private>
     </Reference>
     <Reference Include="FastMember.Signed, Version=1.0.0.9, Culture=neutral, PublicKeyToken=9e8f22703bef9a29, processorArchitecture=MSIL">
@@ -342,7 +342,9 @@
       <Link>.editorconfig</Link>
     </None>
     <None Include="ClosedXML.snk" />
-    <None Include="packages.config" />
+    <None Include="packages.config">
+      <SubType>Designer</SubType>
+    </None>
   </ItemGroup>
   <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
   <!-- To modify your build process, add your task inside one of the targets below and uncomment it. 
diff --git a/ClosedXML/Excel/CalcEngine/CalcEngine.cs b/ClosedXML/Excel/CalcEngine/CalcEngine.cs
index 39af87c..71e3d72 100644
--- a/ClosedXML/Excel/CalcEngine/CalcEngine.cs
+++ b/ClosedXML/Excel/CalcEngine/CalcEngine.cs
@@ -444,10 +444,11 @@
                 // sub-expressions
                 case TKTYPE.GROUP:
 
-                    // anything other than opening parenthesis is illegal here
+                    // Normally anything other than opening parenthesis is illegal here
+                    // but Excel allows omitted parameters so return empty value expression.
                     if (_token.ID != TKID.OPEN)
                     {
-                        Throw("Expression expected.");
+                        return new EmptyValueExpression();
                     }
 
                     // get expression
diff --git a/ClosedXML/Excel/CalcEngine/Expression.cs b/ClosedXML/Excel/CalcEngine/Expression.cs
index 1f11c8b..dcac3c0 100644
--- a/ClosedXML/Excel/CalcEngine/Expression.cs
+++ b/ClosedXML/Excel/CalcEngine/Expression.cs
@@ -403,6 +403,15 @@
             return (_value as IEnumerable).GetEnumerator();
         }
     }
+
+    /// <summary>
+    /// Expression that represents an omitted parameter.
+    /// </summary>
+    class EmptyValueExpression : Expression
+    {
+        internal EmptyValueExpression() { }
+    }
+
     /// <summary>
     /// Interface supported by external objects that have to return a value
     /// other than themselves (e.g. a cell range object should return the
diff --git a/ClosedXML/Excel/CalcEngine/Functions/Logical.cs b/ClosedXML/Excel/CalcEngine/Functions/Logical.cs
index b71e862..d5fa418 100644
--- a/ClosedXML/Excel/CalcEngine/Functions/Logical.cs
+++ b/ClosedXML/Excel/CalcEngine/Functions/Logical.cs
@@ -47,7 +47,14 @@
             {
                 return p[1].Evaluate();
             }
-            return p.Count > 2 ? p[2].Evaluate() : false;
+            else if (p.Count > 2)
+            {
+                if (p[2] is EmptyValueExpression)
+                    return false;
+                else
+                    return p[2].Evaluate();
+            }
+            else return false;
         }
 
         static object True(List<Expression> p)
@@ -72,4 +79,4 @@
             }
         }
     }
-}
\ No newline at end of file
+}
diff --git a/ClosedXML/Excel/CalcEngine/Functions/MathTrig.cs b/ClosedXML/Excel/CalcEngine/Functions/MathTrig.cs
index 512b609..c4e86ca 100644
--- a/ClosedXML/Excel/CalcEngine/Functions/MathTrig.cs
+++ b/ClosedXML/Excel/CalcEngine/Functions/MathTrig.cs
@@ -470,13 +470,13 @@
             var digits = (Int32)(Double)p[1];
             if (digits >= 0)
             {
-                return Math.Round(value, digits);
+                return Math.Round(value, digits, MidpointRounding.AwayFromZero);
             }
             else
             {
                 digits = Math.Abs(digits);
                 double temp = value / Math.Pow(10, digits);
-                temp = Math.Round(temp, 0);
+                temp = Math.Round(temp, 0, MidpointRounding.AwayFromZero);
                 return temp * Math.Pow(10, digits);
             }
 
diff --git a/ClosedXML/Extensions.cs b/ClosedXML/Extensions.cs
index 747961f..7655168 100644
--- a/ClosedXML/Extensions.cs
+++ b/ClosedXML/Extensions.cs
@@ -172,29 +172,9 @@
 
     public static class IntegerExtensions
     {
-        private static readonly NumberFormatInfo nfi = CultureInfo.InvariantCulture.NumberFormat;
-
-        [ThreadStatic]
-        private static Dictionary<Int32, String> intToString;
-
         public static String ToInvariantString(this Int32 value)
         {
-            String sValue;
-            if (intToString == null)
-            {
-                intToString = new Dictionary<int, string>();
-                sValue = value.ToString(nfi);
-                intToString.Add(value, sValue);
-            }
-            else
-            {
-                if (!intToString.TryGetValue(value, out sValue))
-                {
-                    sValue = value.ToString(nfi);
-                    intToString.Add(value, sValue);
-                }
-            }
-            return sValue;
+            return value.ToString(CultureInfo.InvariantCulture.NumberFormat);
         }
     }
 
diff --git a/ClosedXML/packages.config b/ClosedXML/packages.config
index cd2fc49..bed0dd7 100644
--- a/ClosedXML/packages.config
+++ b/ClosedXML/packages.config
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
 <packages>
-  <package id="DocumentFormat.OpenXml" version="2.7.1" targetFramework="net452" />
+  <package id="DocumentFormat.OpenXml" version="2.7.2" targetFramework="net452" />
   <package id="FastMember.Signed" version="1.1.0" targetFramework="net452" />
 </packages>
\ No newline at end of file
diff --git a/ClosedXML_Examples/ClosedXML_Examples.csproj b/ClosedXML_Examples/ClosedXML_Examples.csproj
index 16e493e..30a0fa7 100644
--- a/ClosedXML_Examples/ClosedXML_Examples.csproj
+++ b/ClosedXML_Examples/ClosedXML_Examples.csproj
@@ -48,8 +48,8 @@
     <NoWin32Manifest>true</NoWin32Manifest>
   </PropertyGroup>
   <ItemGroup>
-    <Reference Include="DocumentFormat.OpenXml, Version=0.0.1.0, Culture=neutral, PublicKeyToken=8fb06cb64d019a17, processorArchitecture=MSIL">
-      <HintPath>..\packages\DocumentFormat.OpenXml.2.7.1\lib\net45\DocumentFormat.OpenXml.dll</HintPath>
+    <Reference Include="DocumentFormat.OpenXml, Version=2.7.2.0, Culture=neutral, PublicKeyToken=8fb06cb64d019a17, processorArchitecture=MSIL">
+      <HintPath>..\packages\DocumentFormat.OpenXml.2.7.2\lib\net40\DocumentFormat.OpenXml.dll</HintPath>
       <Private>True</Private>
     </Reference>
     <Reference Include="System" />
diff --git a/ClosedXML_Examples/packages.config b/ClosedXML_Examples/packages.config
index 93a1c7a..b2df7ba 100644
--- a/ClosedXML_Examples/packages.config
+++ b/ClosedXML_Examples/packages.config
@@ -1,4 +1,4 @@
 <?xml version="1.0" encoding="utf-8"?>
 <packages>
-  <package id="DocumentFormat.OpenXml" version="2.7.1" targetFramework="net452" />
+  <package id="DocumentFormat.OpenXml" version="2.7.2" targetFramework="net452" />
 </packages>
\ No newline at end of file
diff --git a/ClosedXML_Sandbox/ClosedXML_Sandbox.csproj b/ClosedXML_Sandbox/ClosedXML_Sandbox.csproj
index 5c7b02a..18fa269 100644
--- a/ClosedXML_Sandbox/ClosedXML_Sandbox.csproj
+++ b/ClosedXML_Sandbox/ClosedXML_Sandbox.csproj
@@ -34,8 +34,8 @@
     <Prefer32Bit>false</Prefer32Bit>
   </PropertyGroup>
   <ItemGroup>
-    <Reference Include="DocumentFormat.OpenXml, Version=0.0.1.0, Culture=neutral, PublicKeyToken=8fb06cb64d019a17, processorArchitecture=MSIL">
-      <HintPath>..\packages\DocumentFormat.OpenXml.2.7.1\lib\net45\DocumentFormat.OpenXml.dll</HintPath>
+    <Reference Include="DocumentFormat.OpenXml, Version=2.7.2.0, Culture=neutral, PublicKeyToken=8fb06cb64d019a17, processorArchitecture=MSIL">
+      <HintPath>..\packages\DocumentFormat.OpenXml.2.7.2\lib\net40\DocumentFormat.OpenXml.dll</HintPath>
       <Private>True</Private>
     </Reference>
     <Reference Include="System" />
diff --git a/ClosedXML_Sandbox/packages.config b/ClosedXML_Sandbox/packages.config
index 93a1c7a..b2df7ba 100644
--- a/ClosedXML_Sandbox/packages.config
+++ b/ClosedXML_Sandbox/packages.config
@@ -1,4 +1,4 @@
 <?xml version="1.0" encoding="utf-8"?>
 <packages>
-  <package id="DocumentFormat.OpenXml" version="2.7.1" targetFramework="net452" />
+  <package id="DocumentFormat.OpenXml" version="2.7.2" targetFramework="net452" />
 </packages>
\ No newline at end of file
diff --git a/ClosedXML_Tests/ClosedXML_Tests.csproj b/ClosedXML_Tests/ClosedXML_Tests.csproj
index ba753e5..e06cc44 100644
--- a/ClosedXML_Tests/ClosedXML_Tests.csproj
+++ b/ClosedXML_Tests/ClosedXML_Tests.csproj
@@ -43,8 +43,8 @@
     <AssemblyOriginatorKeyFile>ClosedXML.snk</AssemblyOriginatorKeyFile>
   </PropertyGroup>
   <ItemGroup>
-    <Reference Include="DocumentFormat.OpenXml, Version=0.0.1.0, Culture=neutral, PublicKeyToken=8fb06cb64d019a17, processorArchitecture=MSIL">
-      <HintPath>..\packages\DocumentFormat.OpenXml.2.7.1\lib\net45\DocumentFormat.OpenXml.dll</HintPath>
+    <Reference Include="DocumentFormat.OpenXml, Version=2.7.2.0, Culture=neutral, PublicKeyToken=8fb06cb64d019a17, processorArchitecture=MSIL">
+      <HintPath>..\packages\DocumentFormat.OpenXml.2.7.2\lib\net40\DocumentFormat.OpenXml.dll</HintPath>
       <Private>True</Private>
     </Reference>
     <Reference Include="Microsoft.CSharp" />
diff --git a/ClosedXML_Tests/Excel/CalcEngine/FunctionsTests.cs b/ClosedXML_Tests/Excel/CalcEngine/FunctionsTests.cs
index ce5ae67..3fca48e 100644
--- a/ClosedXML_Tests/Excel/CalcEngine/FunctionsTests.cs
+++ b/ClosedXML_Tests/Excel/CalcEngine/FunctionsTests.cs
@@ -379,6 +379,12 @@
 
             actual = XLWorkbook.EvaluateExpr("Round(-50.55, -2)");
             Assert.AreEqual(-100.0, actual);
+            
+            actual = XLWorkbook.EvaluateExpr("ROUND(59 * 0.535, 2)"); // (59 * 0.535) = 31.565
+            Assert.AreEqual(31.57, actual);
+
+            actual = XLWorkbook.EvaluateExpr("ROUND(59 * -0.535, 2)"); // (59 * -0.535) = -31.565
+            Assert.AreEqual(-31.57, actual);
         }
 
         [Test]
@@ -616,5 +622,25 @@
             Assert.AreEqual(0, cell.Value);
             Assert.That(() => wb.Worksheet(1).Cell(3, 1).SetFormulaA1("=AVERAGE(D1,D2)").Value, Throws.Exception);
         }
+
+        [Test]
+        public void TestOmittedParameters()
+        {
+            using (var wb = new XLWorkbook())
+            {
+                object value;
+                value = wb.Evaluate("=IF(TRUE,1)");
+                Assert.AreEqual(1, value);
+
+                value = wb.Evaluate("=IF(TRUE,1,)");
+                Assert.AreEqual(1, value);
+
+                value = wb.Evaluate("=IF(FALSE,1,)");
+                Assert.AreEqual(false, value);
+
+                value = wb.Evaluate("=IF(FALSE,,2)");
+                Assert.AreEqual(2, value);
+            }
+        }
     }
 }
diff --git a/ClosedXML_Tests/Resource/Examples/AutoFilter/CustomAutoFilter.xlsx b/ClosedXML_Tests/Resource/Examples/AutoFilter/CustomAutoFilter.xlsx
index 12e3646..2ee0c8d 100644
--- a/ClosedXML_Tests/Resource/Examples/AutoFilter/CustomAutoFilter.xlsx
+++ b/ClosedXML_Tests/Resource/Examples/AutoFilter/CustomAutoFilter.xlsx
Binary files differ
diff --git a/ClosedXML_Tests/Resource/Examples/AutoFilter/DynamicAutoFilter.xlsx b/ClosedXML_Tests/Resource/Examples/AutoFilter/DynamicAutoFilter.xlsx
index 7e82d6b..0b2fb27 100644
--- a/ClosedXML_Tests/Resource/Examples/AutoFilter/DynamicAutoFilter.xlsx
+++ b/ClosedXML_Tests/Resource/Examples/AutoFilter/DynamicAutoFilter.xlsx
Binary files differ
diff --git a/ClosedXML_Tests/Resource/Examples/AutoFilter/RegularAutoFilter.xlsx b/ClosedXML_Tests/Resource/Examples/AutoFilter/RegularAutoFilter.xlsx
index e74cd54..7221dae 100644
--- a/ClosedXML_Tests/Resource/Examples/AutoFilter/RegularAutoFilter.xlsx
+++ b/ClosedXML_Tests/Resource/Examples/AutoFilter/RegularAutoFilter.xlsx
Binary files differ
diff --git a/ClosedXML_Tests/Resource/Examples/AutoFilter/TopBottomAutoFilter.xlsx b/ClosedXML_Tests/Resource/Examples/AutoFilter/TopBottomAutoFilter.xlsx
index 8570228..4e069ba 100644
--- a/ClosedXML_Tests/Resource/Examples/AutoFilter/TopBottomAutoFilter.xlsx
+++ b/ClosedXML_Tests/Resource/Examples/AutoFilter/TopBottomAutoFilter.xlsx
Binary files differ
diff --git a/ClosedXML_Tests/Resource/Examples/Columns/ColumnCells.xlsx b/ClosedXML_Tests/Resource/Examples/Columns/ColumnCells.xlsx
index 464d657..2e35af2 100644
--- a/ClosedXML_Tests/Resource/Examples/Columns/ColumnCells.xlsx
+++ b/ClosedXML_Tests/Resource/Examples/Columns/ColumnCells.xlsx
Binary files differ
diff --git a/ClosedXML_Tests/Resource/Examples/Columns/ColumnCollection.xlsx b/ClosedXML_Tests/Resource/Examples/Columns/ColumnCollection.xlsx
index af8b936..8210ecf 100644
--- a/ClosedXML_Tests/Resource/Examples/Columns/ColumnCollection.xlsx
+++ b/ClosedXML_Tests/Resource/Examples/Columns/ColumnCollection.xlsx
Binary files differ
diff --git a/ClosedXML_Tests/Resource/Examples/Columns/ColumnSettings.xlsx b/ClosedXML_Tests/Resource/Examples/Columns/ColumnSettings.xlsx
index 5e599eb..d729b73 100644
--- a/ClosedXML_Tests/Resource/Examples/Columns/ColumnSettings.xlsx
+++ b/ClosedXML_Tests/Resource/Examples/Columns/ColumnSettings.xlsx
Binary files differ
diff --git a/ClosedXML_Tests/Resource/Examples/Columns/DeletingColumns.xlsx b/ClosedXML_Tests/Resource/Examples/Columns/DeletingColumns.xlsx
index 376a2ec..bac6e30 100644
--- a/ClosedXML_Tests/Resource/Examples/Columns/DeletingColumns.xlsx
+++ b/ClosedXML_Tests/Resource/Examples/Columns/DeletingColumns.xlsx
Binary files differ
diff --git a/ClosedXML_Tests/Resource/Examples/Comments/AddingComments.xlsx b/ClosedXML_Tests/Resource/Examples/Comments/AddingComments.xlsx
index b31b4df..3879998 100644
--- a/ClosedXML_Tests/Resource/Examples/Comments/AddingComments.xlsx
+++ b/ClosedXML_Tests/Resource/Examples/Comments/AddingComments.xlsx
Binary files differ
diff --git a/ClosedXML_Tests/Resource/Examples/ConditionalFormatting/CFColorScaleLowHigh.xlsx b/ClosedXML_Tests/Resource/Examples/ConditionalFormatting/CFColorScaleLowHigh.xlsx
index 090eb37..8e28b85 100644
--- a/ClosedXML_Tests/Resource/Examples/ConditionalFormatting/CFColorScaleLowHigh.xlsx
+++ b/ClosedXML_Tests/Resource/Examples/ConditionalFormatting/CFColorScaleLowHigh.xlsx
Binary files differ
diff --git a/ClosedXML_Tests/Resource/Examples/ConditionalFormatting/CFColorScaleLowMidHigh.xlsx b/ClosedXML_Tests/Resource/Examples/ConditionalFormatting/CFColorScaleLowMidHigh.xlsx
index 9bc4eb6..a9216c5 100644
--- a/ClosedXML_Tests/Resource/Examples/ConditionalFormatting/CFColorScaleLowMidHigh.xlsx
+++ b/ClosedXML_Tests/Resource/Examples/ConditionalFormatting/CFColorScaleLowMidHigh.xlsx
Binary files differ
diff --git a/ClosedXML_Tests/Resource/Examples/ConditionalFormatting/CFColorScaleMinimumMaximum.xlsx b/ClosedXML_Tests/Resource/Examples/ConditionalFormatting/CFColorScaleMinimumMaximum.xlsx
index ef35d8b..965c332 100644
--- a/ClosedXML_Tests/Resource/Examples/ConditionalFormatting/CFColorScaleMinimumMaximum.xlsx
+++ b/ClosedXML_Tests/Resource/Examples/ConditionalFormatting/CFColorScaleMinimumMaximum.xlsx
Binary files differ
diff --git a/ClosedXML_Tests/Resource/Examples/ConditionalFormatting/CFContains.xlsx b/ClosedXML_Tests/Resource/Examples/ConditionalFormatting/CFContains.xlsx
index f28c424..4721b41 100644
--- a/ClosedXML_Tests/Resource/Examples/ConditionalFormatting/CFContains.xlsx
+++ b/ClosedXML_Tests/Resource/Examples/ConditionalFormatting/CFContains.xlsx
Binary files differ
diff --git a/ClosedXML_Tests/Resource/Examples/ConditionalFormatting/CFDataBar.xlsx b/ClosedXML_Tests/Resource/Examples/ConditionalFormatting/CFDataBar.xlsx
index c98b5dd..4db382d 100644
--- a/ClosedXML_Tests/Resource/Examples/ConditionalFormatting/CFDataBar.xlsx
+++ b/ClosedXML_Tests/Resource/Examples/ConditionalFormatting/CFDataBar.xlsx
Binary files differ
diff --git a/ClosedXML_Tests/Resource/Examples/ConditionalFormatting/CFEndsWith.xlsx b/ClosedXML_Tests/Resource/Examples/ConditionalFormatting/CFEndsWith.xlsx
index c8fb0a8..e2d4308 100644
--- a/ClosedXML_Tests/Resource/Examples/ConditionalFormatting/CFEndsWith.xlsx
+++ b/ClosedXML_Tests/Resource/Examples/ConditionalFormatting/CFEndsWith.xlsx
Binary files differ
diff --git a/ClosedXML_Tests/Resource/Examples/ConditionalFormatting/CFEqualsNumber.xlsx b/ClosedXML_Tests/Resource/Examples/ConditionalFormatting/CFEqualsNumber.xlsx
index d581542..a75c503 100644
--- a/ClosedXML_Tests/Resource/Examples/ConditionalFormatting/CFEqualsNumber.xlsx
+++ b/ClosedXML_Tests/Resource/Examples/ConditionalFormatting/CFEqualsNumber.xlsx
Binary files differ
diff --git a/ClosedXML_Tests/Resource/Examples/ConditionalFormatting/CFEqualsString.xlsx b/ClosedXML_Tests/Resource/Examples/ConditionalFormatting/CFEqualsString.xlsx
index f17ce56..07e8628 100644
--- a/ClosedXML_Tests/Resource/Examples/ConditionalFormatting/CFEqualsString.xlsx
+++ b/ClosedXML_Tests/Resource/Examples/ConditionalFormatting/CFEqualsString.xlsx
Binary files differ
diff --git a/ClosedXML_Tests/Resource/Examples/ConditionalFormatting/CFIconSet.xlsx b/ClosedXML_Tests/Resource/Examples/ConditionalFormatting/CFIconSet.xlsx
index c239c29..fb91ef7 100644
--- a/ClosedXML_Tests/Resource/Examples/ConditionalFormatting/CFIconSet.xlsx
+++ b/ClosedXML_Tests/Resource/Examples/ConditionalFormatting/CFIconSet.xlsx
Binary files differ
diff --git a/ClosedXML_Tests/Resource/Examples/ConditionalFormatting/CFIsBlank.xlsx b/ClosedXML_Tests/Resource/Examples/ConditionalFormatting/CFIsBlank.xlsx
index 3878859..80be4ab 100644
--- a/ClosedXML_Tests/Resource/Examples/ConditionalFormatting/CFIsBlank.xlsx
+++ b/ClosedXML_Tests/Resource/Examples/ConditionalFormatting/CFIsBlank.xlsx
Binary files differ
diff --git a/ClosedXML_Tests/Resource/Examples/ConditionalFormatting/CFIsError.xlsx b/ClosedXML_Tests/Resource/Examples/ConditionalFormatting/CFIsError.xlsx
index 58db21c..e952a7f 100644
--- a/ClosedXML_Tests/Resource/Examples/ConditionalFormatting/CFIsError.xlsx
+++ b/ClosedXML_Tests/Resource/Examples/ConditionalFormatting/CFIsError.xlsx
Binary files differ
diff --git a/ClosedXML_Tests/Resource/Examples/ConditionalFormatting/CFMultipleConditions.xlsx b/ClosedXML_Tests/Resource/Examples/ConditionalFormatting/CFMultipleConditions.xlsx
index 4a5e54a..0d31d2a 100644
--- a/ClosedXML_Tests/Resource/Examples/ConditionalFormatting/CFMultipleConditions.xlsx
+++ b/ClosedXML_Tests/Resource/Examples/ConditionalFormatting/CFMultipleConditions.xlsx
Binary files differ
diff --git a/ClosedXML_Tests/Resource/Examples/ConditionalFormatting/CFNotBlank.xlsx b/ClosedXML_Tests/Resource/Examples/ConditionalFormatting/CFNotBlank.xlsx
index cdc0d3b..5f4f6ce 100644
--- a/ClosedXML_Tests/Resource/Examples/ConditionalFormatting/CFNotBlank.xlsx
+++ b/ClosedXML_Tests/Resource/Examples/ConditionalFormatting/CFNotBlank.xlsx
Binary files differ
diff --git a/ClosedXML_Tests/Resource/Examples/ConditionalFormatting/CFNotContains.xlsx b/ClosedXML_Tests/Resource/Examples/ConditionalFormatting/CFNotContains.xlsx
index 9cc4378..1b3b379 100644
--- a/ClosedXML_Tests/Resource/Examples/ConditionalFormatting/CFNotContains.xlsx
+++ b/ClosedXML_Tests/Resource/Examples/ConditionalFormatting/CFNotContains.xlsx
Binary files differ
diff --git a/ClosedXML_Tests/Resource/Examples/ConditionalFormatting/CFNotEqualsNumber.xlsx b/ClosedXML_Tests/Resource/Examples/ConditionalFormatting/CFNotEqualsNumber.xlsx
index f0b3c45..7d1bd15 100644
--- a/ClosedXML_Tests/Resource/Examples/ConditionalFormatting/CFNotEqualsNumber.xlsx
+++ b/ClosedXML_Tests/Resource/Examples/ConditionalFormatting/CFNotEqualsNumber.xlsx
Binary files differ
diff --git a/ClosedXML_Tests/Resource/Examples/ConditionalFormatting/CFNotEqualsString.xlsx b/ClosedXML_Tests/Resource/Examples/ConditionalFormatting/CFNotEqualsString.xlsx
index ddd478d..531411d 100644
--- a/ClosedXML_Tests/Resource/Examples/ConditionalFormatting/CFNotEqualsString.xlsx
+++ b/ClosedXML_Tests/Resource/Examples/ConditionalFormatting/CFNotEqualsString.xlsx
Binary files differ
diff --git a/ClosedXML_Tests/Resource/Examples/ConditionalFormatting/CFNotError.xlsx b/ClosedXML_Tests/Resource/Examples/ConditionalFormatting/CFNotError.xlsx
index 158e8e7..9b07849 100644
--- a/ClosedXML_Tests/Resource/Examples/ConditionalFormatting/CFNotError.xlsx
+++ b/ClosedXML_Tests/Resource/Examples/ConditionalFormatting/CFNotError.xlsx
Binary files differ
diff --git a/ClosedXML_Tests/Resource/Examples/ConditionalFormatting/CFStartsWith.xlsx b/ClosedXML_Tests/Resource/Examples/ConditionalFormatting/CFStartsWith.xlsx
index 1921ef3..e19f30e 100644
--- a/ClosedXML_Tests/Resource/Examples/ConditionalFormatting/CFStartsWith.xlsx
+++ b/ClosedXML_Tests/Resource/Examples/ConditionalFormatting/CFStartsWith.xlsx
Binary files differ
diff --git a/ClosedXML_Tests/Resource/Examples/Delete/DeleteFewWorksheets.xlsx b/ClosedXML_Tests/Resource/Examples/Delete/DeleteFewWorksheets.xlsx
index 617ed94..0bfcae5 100644
--- a/ClosedXML_Tests/Resource/Examples/Delete/DeleteFewWorksheets.xlsx
+++ b/ClosedXML_Tests/Resource/Examples/Delete/DeleteFewWorksheets.xlsx
Binary files differ
diff --git a/ClosedXML_Tests/Resource/Examples/Delete/RemoveRows.xlsx b/ClosedXML_Tests/Resource/Examples/Delete/RemoveRows.xlsx
index 7a22bb6..3a4822a 100644
--- a/ClosedXML_Tests/Resource/Examples/Delete/RemoveRows.xlsx
+++ b/ClosedXML_Tests/Resource/Examples/Delete/RemoveRows.xlsx
Binary files differ
diff --git a/ClosedXML_Tests/Resource/Examples/ImageHandling/ImageAnchors.xlsx b/ClosedXML_Tests/Resource/Examples/ImageHandling/ImageAnchors.xlsx
index 01a903c..53aa802 100644
--- a/ClosedXML_Tests/Resource/Examples/ImageHandling/ImageAnchors.xlsx
+++ b/ClosedXML_Tests/Resource/Examples/ImageHandling/ImageAnchors.xlsx
Binary files differ
diff --git a/ClosedXML_Tests/Resource/Examples/ImageHandling/ImageFormats.xlsx b/ClosedXML_Tests/Resource/Examples/ImageHandling/ImageFormats.xlsx
index 7beff62..237d910 100644
--- a/ClosedXML_Tests/Resource/Examples/ImageHandling/ImageFormats.xlsx
+++ b/ClosedXML_Tests/Resource/Examples/ImageHandling/ImageFormats.xlsx
Binary files differ
diff --git a/ClosedXML_Tests/Resource/Examples/Loading/ChangingBasicTable.xlsx b/ClosedXML_Tests/Resource/Examples/Loading/ChangingBasicTable.xlsx
index e620dd7..30a397a 100644
--- a/ClosedXML_Tests/Resource/Examples/Loading/ChangingBasicTable.xlsx
+++ b/ClosedXML_Tests/Resource/Examples/Loading/ChangingBasicTable.xlsx
Binary files differ
diff --git a/ClosedXML_Tests/Resource/Examples/Misc/AddingDataSet.xlsx b/ClosedXML_Tests/Resource/Examples/Misc/AddingDataSet.xlsx
index 1c3d359..c5abda2 100644
--- a/ClosedXML_Tests/Resource/Examples/Misc/AddingDataSet.xlsx
+++ b/ClosedXML_Tests/Resource/Examples/Misc/AddingDataSet.xlsx
Binary files differ
diff --git a/ClosedXML_Tests/Resource/Examples/Misc/AddingDataTableAsWorksheet.xlsx b/ClosedXML_Tests/Resource/Examples/Misc/AddingDataTableAsWorksheet.xlsx
index 21de466..3dcec19 100644
--- a/ClosedXML_Tests/Resource/Examples/Misc/AddingDataTableAsWorksheet.xlsx
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 <?xml version="1.0" encoding="utf-8"?>
 <packages>
-  <package id="DocumentFormat.OpenXml" version="2.7.1" targetFramework="net452" />
+  <package id="DocumentFormat.OpenXml" version="2.7.2" targetFramework="net452" />
   <package id="NUnit" version="3.4.1" targetFramework="net452" />
 </packages>
\ No newline at end of file
diff --git a/README.md b/README.md
index 961bba2..2e5ed79 100644
--- a/README.md
+++ b/README.md
@@ -2,7 +2,7 @@
 # ClosedXML
 [![Build status](https://ci.appveyor.com/api/projects/status/wobbmnlbukxejjgb?svg=true)](https://ci.appveyor.com/project/Pyropace/closedxml)
 
-ClosedXML makes it easier for developers to create Excel 2007/2010/2013 files. It provides a nice object oriented way to manipulate the files (similar to VBA) without dealing with the hassles of XML Documents. It can be used by any .NET language like C# and Visual Basic (VB).
+ClosedXML makes it easier for developers to create Excel 2007+ (.xlsx, .xlsm, etc) files. It provides a nice object oriented way to manipulate the files (similar to VBA) without dealing with the hassles of XML Documents. It can be used by any .NET language like C# and Visual Basic (VB).
 
 [For more information see the wiki](https://github.com/closedxml/closedxml/wiki)
 
@@ -18,7 +18,7 @@
 
 ### What can you do with this?
 
-ClosedXML allows you to create Excel 2007/2010/2013 files without the Excel application. The typical example is creating Excel reports on a web server.
+ClosedXML allows you to create Excel 2007+ (.xlsx, .xlsm, etc) files without the Excel application. The typical example is creating Excel reports on a web server.
 
 If you've ever used the Microsoft Open XML Format SDK you know just how much code you have to write to get the same results as the following 4 lines of code.
 
@@ -28,3 +28,14 @@
 worksheet.Cell("A1").Value = "Hello World!";
 workbook.SaveAs("HelloWorld.xlsx");
 ```
+
+### Extensions
+Be sure to check out our `ClosedXML` extension projects
+- https://github.com/ClosedXML/ClosedXML.Extensions.AspNet
+- https://github.com/ClosedXML/ClosedXML.Extensions.Mvc
+
+## Developer guidelines
+_Full guidelines to follow later_
+* Please submit pull requests that are based on the `develop` branch.
+* Where possible, pull requests should include unit tests that cover as many uses cases as possible. This is especially relevant when implementing Excel functions.
+* Install [NUnit 3.0 Test Adapter](https://github.com/nunit/docs/wiki/Adapter-Installation) if you want to run the test suite in Visual Studio.