Lync 2010 Client Deployment Exit Code 1

Hello,
I have a little issue while uninstalling Lync 2010 Client by SCCM 2012: AppEnforce.log reports this error: Process <PID> terminated with exitcode: 1
SCCM traps application exit codes only, so the problem comes from Lync setup program.
The command launched is Lync2010.exe /Silent /Uninstall.

What does Exit Code 1 means (e.g. Success - reboot required) ?

Thank you,
Luca

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