Just an FYI for those of you running Microsoft Office for Mac 2011 - the last version available before Office 365 was introduced and for some time the only version available without moving to their 365 subscription model.
I've just updated to the latest patch and after launching Word for the first time afterwards a banner popped up...
I believe MS do now offer a full outright Office 365 licence for around £120 if you don't want to do down the subscription route, and for now Office 2011 seems to work OK on my system (10.10), but at some point when it does break you'll have to fork out one way or another. Not sure how it runs on High Sierra?
Anyway, just a heads up.