Lync 2013 server is a fabulous product – implementation was very smooth. But when it came to client rollout, we struggled about a strange bug:

Selecting a Lync contact and open contact card. When you selected organization to show the team and manager of the contact -> BOOM! The Lync-client closes with application exception.

No really useful event log entries:

Name der fehlerhaften Anwendung: lync.exe, Version: 15.0.4454.1506, Zeitstempel: 0x50d185e0
Name des fehlerhaften Moduls: KERNELBASE.dll, Version: 6.1.7601.18015, Zeitstempel: 0x50b83c8a
Ausnahmecode: 0xc0000005

Name der fehlerhaften Anwendung: lync.exe, Version: 15.0.4454.1506, Zeitstempel: 0x50d185e0
Name des fehlerhaften Moduls: ntdll.dll, Version: 6.1.7601.17725, Zeitstempel: 0x4ec49b8f
Ausnahmecode: 0xc0000005
Fehleroffset: 0x0002dede
ID des fehlerhaften Prozesses: 0x1808

After hours of debugging and working with PSS, the solution was easy:

The head of an organization must have no manager in this AD object!

In our case our CEO had his own AD object as manager. Removing the “manager loop” from his AD object fixed the issue.