I'm also a newbie. I have a new iMac with OS X El Capitan version 10.11.3 that I purchased in October 2015. I paid for Microsoft Office 2016 for Mac and had it downloaded before I left the Apple store. I didn't have any issues until recently. Excel seems to be the one that has the problem (Word seems fine). When I double click on a file or try to open it directly I get "..... application quit unexpectedly". I'm not getting any help from their support. In order to get their advanced support, I'd have to pay $99 OR subscribe to Office 365, which I don't want or need! I was wondering if anyone else has had a problem accessing Excel (Microsoft Office 2016 for Mac) with an iMac using El Capitan.