Lync for Mac (OSX Yosemite) Sign-in Fails Repeatedly

If you were brave enough to upgrade your Mac to OSX Yosemite (beta) and your Lync for Office 2011 (with Office 365 or Lync on premise) no longer will sign in, the potential fix is listed below.  Primary Symptom: when you attempt to log into Lync, it appears to sign you in just fine, but…

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