Problems installing OCS and not finding .NET 3.5

If you install all the current patches to your server before installing OCS it will install .NET Framework 4.0. When .NET 4.0 is installed OCS cannot detect .NET 3.5 and you receive the error message

Microsoft Office Communications Server 2007 R2, Microsoft Unified Communications Managed API 2.0 Core Redist 64-bit installation requires Microsoft .NET Framework version 3.5. Installation cannot continue.

Microsoft has put up a knowledge base article kb2224981 describing the issue and also the work around.

To resolve this problem, follow these steps:

  1. Remove .NET Framework 4.0 from the server. 
  2. Install the OCS products that you want to have on the server
  3. Install .NET Framework 4.0 on the server
Advertisements

Leave a Reply

Please log in using one of these methods to post your comment:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s

%d bloggers like this: