Thanks to an alert from Jordan Loehr today, here's a heads-up on an issue created by the Skype for Business update. Also, thanks to Jordan, there's a workaround.

Per Jordan, if you have Office 2010 installed on a system that also has Lync 2013, when the KB2889923 upgrade package for Skype for Business is installed, Outlook 2010 stops working.

Here's the workaround: