Issue :

Users are unable to view the presence info for an Outlook 2013 client after upgrading from Lync 2010 >  Lync 2013.

Cause :

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,

[HKEY_CURRENT_USER\Software\IM Providers]
"DefaultIMApp"="Lync"

HKEY_CURRENT_USER\Software\IM Providers\Communicator]
"ProcessId"=dword:00002458
"UpAndRunning"=dword:00000002

[HKEY_CURRENT_USER\Software\IM Providers\Lync]
"ProcessId"=dword:00002458
"UpAndRunning"=dword:00000002

Note : The "UpAndRunning" DWORD indicates the application that is current running

Resolution :

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.

HKEY_CURRENT_USER\Software\IM Providers

REG_SZ: DefaultIMApp

In our case the above mentioned key was set to "Lync" and we didn't have to edit this entry.

Thanks & Regards

Rahul Thomas