Unfortunately for those who paid between $70 and $240 to use Office 2016 on their Macs, there's no way for them to know when they will be able to effectively use the product. According to numerous users, Outlook 2011 displays the same problems when used on El Capitan. If you want more bad news, it seems that Office 2016 isn't the only one affected by this problem. The only two constants I found in multiple complaints was that firstly, if you have multiple Office apps opened and one of them crashes, all of them follow and secondly, the only way to reuse Office apps after they crash is to reboot your Mac. In case you are wondering what triggers the crash, I can't exactly tell you as most users report it happening at different times, so I guess it's pretty random.