Current Office for Mac and Yosemite
Everything works in MS Office for Mac 2011 just fine for me. I use Word and Excel daily, no problems whatsoever. Outlook for Mac works just fine also. If and when, I have problems with Apple Mail, I always revert to Outlook.
I would prefer to use Apple Mail but there has been no update for Attachment Tamer for Apple Mail in Yosemite, and that is a deal breaker for me. Outlook handles attachments as one would expect.
Try as they might... no one has been able to to build an email client that beats Outlook... and I have tried then all!