frustrating that this issue is flagged as "assumed answered," because the "resolution" described by OP was to give up and install a different product. The internet is full of posts recommending uninstall/reinstall. This is the first post i've found that describes my current issue - it's not that the addin fails to load, it's not that Word crashes. the addin loads. the acrobat buttons are there. they just don't do anything WHEN OFFICE is installed as a STORE APP. Interestingly, the Adobe PDF printer can still be used without issue, but the office plugin doesn't work. and I recognize this is a problem MS, not Adobe, has created, but i'm hoping it's one that Adobe can solve.