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Migrating Office Solutions to the .NET Framework 4 or the .NET Framework 4.5

If the target framework of an Office project is changed to the .NET Framework 4 or the .NET Framework 4.5 from an earlier version of the .NET Framework, some additional steps might be required to continue to run the solution on development and end user computers. For more information, see Required Changes to Run Office Projects that You Migrate to the .NET Framework 4 or the .NET Framework 4.5.

In addition, the project might no longer compile. Some features of Office projects have different programming models for different versions of the .NET Framework. When the target framework of an Office project is changed to the .NET Framework 4 or the .NET Framework 4.5 from an earlier version of the .NET Framework, you must make the following code changes to the project:

The target framework of an Office project changes when you upgrade that project from an earlier version of Visual Studio. For more information, see Upgrading and Migrating Office Solutions.

For more information about why some features in Office projects have a different programming model when you target the .NET Framework 4 or the .NET Framework 4.5, see Changes to the Design of Office Projects that Target the .NET Framework 4 or the .NET Framework 4.5 and Visual Studio Tools for Office Runtime Overview.

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