Microsoft’s Patch Tuesday on december 8th 2015 released update KB3114409, intended to help admins keep Outlook 2010 from starting in safe mode, has in fact done the opposite. Many Outlook 2010 customers report that installing KB 3114409 forces Outlook to start in safe mode, and thereby also removing signatures.

Wednesday morning the patch was called back, but if you’re experiencing odd problems with Outlook 2010 — it opens in safe mode only (always opens maximized and has no sounds, no reading pane, or other view settings that stick), has broken templates, and much more — you should uninstall it.

Depending on your infrastructure there are several approaches. I’m doing the easiest possible way, batch script:

::	Uninstall KB3114409 - 2015-12-05

echo	Shutdown Outlook.
taskkill /im outlook.exe /t /f

echo	Uninstalling KB3114409.
msiexec /i {90140000-0011-0000-0000-0000000FF1CE} MSIPATCHREMOVE={14CDCBF7-3CCC-42E2-A5BB-2D4926E16FAA} /qn