How to install .Net Framework 3.5 on Windows 2008 R2 server

As a prerequisite of Exchange 2010 server I tried to install .Net Framework 3.5 on a Windows 2008 R2 server. So I downloaded the dotnetfx35 executable and started the setup.

The setup failed with the following error:

You must use the Role Management Tool to install …

Research learned that .Net Framework 3.5 is a feature that is already included in Windows 2008 R2. You only have to enable it.

To enable it follow these steps:

Step 1

Step 2

Step 3

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