Microsoft Office for Mac team just published that the recent update to Mac OS X Lion 10.7.2 installs an invalid login certificate on most systems, which results in Lync for Mac crashing when it tries to sign in.
The tema promises to release a software update soon. Meanwhile, if you are facing the above mentioned issues, there is a workaround that seems to be working for most users -- per Office for Mac team blog post:
- Open the utility Keychain Access - from Finder to go Applications and then into the Utilities folder. Or just search for it via Spotlight.
- In Keychain Access - in the left pane click on "login" on the top, and "Certificates" on the bottom.
- In the right pane, find a certificate with the name "unknown". Select it and delete it. You may have to unlock your keychain with your password.
- Close Keychain Access.
- Restart Microsoft Lync.