Restrictive and convoluted Licensing / Distribution Model
I would never recommend Office 365 to a business. The licensing model is junk, and ends up with unrecoverable licenses tied to ex-employee personal email addresses. Not being able to run 64-bit with 32-bit is still an issue, but even worse, is not being able to install a click-to-run application on a volume license application on the same box. Trying to get a refund for incompatible/unusable software is nearly impossible from 3rd party vendors, so we've burned thousands of dollars merely discovering these licensing issues.
These unfortunate architectural decisions have wasted weeks of our time and thousands of dollars just in our company alone. This equates to billions in losses for companies around the world. Are you going to compensate us for our losses? Probably not.
I’ve been a Microsoft developer for twenty years, even worked with you guys for a little bit, but I’ve never seen such poor architectural decisions before, and the damage you’re doing to the industry is recognized everywhere. You’re going to see an exodus away from Office products, stemming from the new licensing models.
I'm still pro-Microsoft, but the buzz I'm hearing is that large companies don't want to put up with this anymore, and are beginning to employ other productivity software, just like we are.
You did this to yourself.