TF14045: The identity <guid> is not a recognized identity

A Team Foundation Server instance I manage, on TFS 2012 Update 1, has had some unhealthy signs for a little while – notifications stopped working, and viewing history for some files\branches displayed an ominous error:

error

It turned out to be due to Active Directory accounts for some contractors being deleted.  Microsoft has a hotfix for this, but in our case updating to TFS 2012 Update 4 did the trick.

Side effect: TFS sent me 350+ notification emails that had been queued up and unable to send.  Whoops!

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