MicrosoftInstalled it on a test VM. A few thoughts:
* I hate that I can't keep its views separate from Outlook on the Web, since the new Outlook is basically Outlook on the Web in a desktop wrapper. I like to keep the reading pane off and in a more compact view on the desktop, and roomier with reading pane enabled on Outlook on the Web. I had different preferences for different scenarios, and now it's converged and I have to pick one for both.
* The account switchover logic when changing to the new Outlook app needs tweaking for users with non-matching UPN and primary SMTP. When it makes you re-authenticate to your mailbox before first launch, it drops your primary SMTP into a web-based authentication window even if the account was originally added via UPN. This makes users get a "can't find account" error if they just click continue without explicitly re-typing their UPN in the sign-in field.
