Have not played with the plugin. Can you post a link as to where to download?
I have found that integration between MiCollab and Office got sticky once we went to Office 2013 via 365. As a crude workaround, I would go into Windows Programs and Features and change the Micollab installation so that there was no integration with anything, including office. All red X's.
I'm not sure how that would affect the plug in, but it's something you might want to play with.