So while I recently wrote on how wonderful the spell check update in Lync 2013is, there is a gotcha. By gotcha I mean bug. Once the update is applied, Outlook calendar presence is no longer synchronized 100% between your Lync client and Outlook. The Microsoft KB article released today (KB2883716) states:

If the meeting cannot be joined by using Lync 2010 or Lync 2013, your presence status isn't updated in Lync 2013 when the meeting starts.

If the meeting is a Lync 2010 or Lync 2013 meeting, your presence status isn’t updated in Lync 2013 until you join the meeting manually.

That’s right, meeting information is broken (you always look available) and OOF is not synchronized either. An update will be resolved with an update at some point so really it comes down to spell check versus correct presence state. Hopefully something will be released soon (and I would suspect it will be) to address this issue.