Just curious if anyone has been able to get Exchange/Outlook.com working with Mail and/or Calendar in Yosemite DP4/PB? I am able to add my account in System Preferences > Internet Accounts (iCloud automatically added it for me - pretty cool). Looks like Calendar is able to read events and details, but when I create or edit an event, it does not sync back to Office365's servers. Mail shows the account in the sidebar, but is never able to connect. It repeatedly asks for the password, which I have confirmed is correct. Interestingly, iOS 7 & 8 both have separate options for "Exchange" and "Outlook.com" in Settings. Whereas Mavericks and Yosemite only have an option for "Exchange". IMO this is likely a temporary issue with the beta, but thought I'd surface it, especially for those looking to jump to Yosemite as their daily driver on a primary machine.