Failed to clean up source mailbox after move

Last year, we upgraded from Exchange 2007 to Exchange 2010 SP3. We moved mailboxes without issue.

Today, I'm running Exchange 2010 SP3 rollup 6, and when I attempt to move any mailbox (existing or newly created ones), I have the exact same problem that is described in this article

http://blogs.msdn.com/b/aacallo/archive/2013/03/20/error-with-moving-mailbox-in-exchange-2010-sp2-ru3.aspx

The article references 2010 SP2, which I never had. I've always been 2010 SP3.  I followed the steps in the article to resolve, but is this a known issue with Exchange 2010 SP3?

Sorry for posting in the 2013 forum, I couldn't find the 2010 forum