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Cannot launch add-in - Microsoft Office support for the .NET Framework 3.5 is not installed

When

After installation of the Pronestor Room & Catering add-in for Microsoft Outlook 2010 - the add-in does not load and the following message is shown:

"The following solution cannot be loaded because Microsoft Office support for the .NET Framework 3.5 is not installed. PronestorOutlook.2007Addin.vsto|vstolocal. For more information see http://...."

 

Why

The VSTO for Office 2010 (VSTOR 2010) has not been initialized properly - this is a known issue from Microsoft

 

How to solve

Other

Microsoft Office 2010 Primary Interop Assembly (Download from MS

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