After updating to Office for Mac 2011 14.4.7, I have problems with about 15 past appointments that continually send reminders. I have tried deleting these appointments (many times in various ways), but they not only remain, they keep duplicating themselves. I am now getting over 1600 reminders for these same appointments. Finally had to turn off Office reminders. 

I also am having trouble syncing Outlook calendar on my desktop with my phone. I have over 1400 sync conflicts.