Lync Meeting Add-in Crashes Outlook

Hello,

I am having an issue with the Lync Meeting Add-in. It is crashing Outlook every time I try to edit an occurrence in the calendar. Whether I try to open an occurrence or simply click and drag, Outlook crashes. It says Outlook has stopped working and that Windows is looking for a solution, but never finds one. Once we re-open Outlook, a yellow bar says that an Add-in has caused Outlook to crash, so it becomes disabled, however I still cannot change a calendar occurrence. Could you please point me in the right direction!

W7, Office 2013