I work for a startup made-good, bought by a very large company you have heard of if you live in the US.
The switched us to Office/Outlook about a year ago.
Shit still doesn't work.
My only use of word is to format docs for the business types after I write them, so I don't really care about it. I mean, it is shitty, but whatever, I'm a Unix guy, I'm used to shitty UI.
What does bug me is Outlook. I get invites to meetings after they happen, mail gets randomly delayed for no apparent reason while I get other mail. And the UI does matter more there - they calendar will randomly refresh back to "today" when I'm trying to look at future things. The whole application randomly decides something is wrong and stops working until a restart.
And then there's the freakish "web" vs executable split.
Lots of Excel features don't work on the web, and apparently I use all of them. So after I share something and have to edit it again, I have to use this eunuch version that constantly tells me I'm doing it wrong.
Not too long from now I'll get the locked-down laptop from them, and not have any option to not use them. But that's fine, I expect to be laid off not long after that.