Users are unable to view the presence info for an Outlook 2013 client after upgrading from Lync 2010 > Lync 2013.
The DWORD for "UpAndRunning" for Communicator was set to two even though Lync was set as our default Instant messaging Application .
Below is the registry hive from the affected machine,
Note : The "UpAndRunning" DWORD indicates the application that is current running
We were able to resolve the issue by navigating to the registry and changing the DWORD value to zero.
More Information :
Outlook reads the following registry key in order to display presence information within Outlook.
In our case the above mentioned key was set to "Lync" and we didn't have to edit this entry.
Thanks & Regards