- Log out and quit Lync.
- Go to Finder > press Command+Shift+G > type in /users/<MacUsername>/library > delete the following files:
- Caches > com.microsoft.Lync
- Internet Plug-Ins > MeetingJoinPlugin.plugin
- Keychains > all files beginning with OC__KeyContainer
- Logs > Microsoft-Lync-x.log and Microsoft-Lync.log
- Preferences > com.microsoft.Lync.plist
- Preferences > ByHost > MicrosoftLyncRegistrationDB.xxxx.plist
- Go to Finder > press Command+Shift+G > type in /users/<MacUsername>/documents > navigate to Microsoft User Data > delete the following folders: Microsoft Lync Data and Microsoft Lync History.
- Open Keychain Access from /Applications/Utilities folder.
- Delete all keychains startting with OC__KeyContainer.
- In your Login keychain, delete all e-mail address certificates.
- Empty Trash.
Clearing the Local Cache (Mac) - Lync
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