ISSUE: Cannot dismiss reminders in the Office Reminders application. Items repopulate upon opening Reminders app again.

STEPS ATTEMPTED:
1) Tried deleting existing calendar appointment - original calendar appointment no longer exists in user calendar
2) Tried new identity - does not work
3) Tried dismissing items individually - does not work
4) Checked OWA for the calendar appts - none available
5) Checked sync services - disabled

CONFIGURATION:

OSX 10.8.5 running Office 2011 14.3.7, connected to an Exchange 2010 server (recently upgraded from 2007, seems like this became more of an issue for us when that move happened)


I'm at a loss everyone and the info I've seen around has been unhelpful so far. Multiple users in our org are plagued by this problem. Any thoughts?