In the Edit Location dialog box in Microsoft Lync 2010, you try to select the Learn More link by pressing the TAB key. However, there is no indication when the Learn More link is selected.
Install the following cumulative update:
2467763 Description of the cumulative update package for Lync 2010: January 2011
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.