Stupid Microsoft, this is what I asked about CalDAV and CardDAV support earlier and an instant deal breaker in making any use of Outlook at all whatsoever. In their petty feud with Apple and Google over standards they have forgotten that Outlook is supposed to be an all singing, all dancing, connect to everything premium email and contact client never mind just Exchange. They should have embraced it - I actually expected them too
OS X supports them all, with the familiarity of the apps within Yosemite and clients iPhones they have done another faux pas like Windows 8 and shot themselves in the foot with a product that ashamedly falls short of what's required.
Business as usual the rest of the suite is what truly matters anyway on a Mac and from what I see so far they aren't going wrong with Windows 10 thank goodness..