Q: office 365 on mavericks incompatible

I have the same probelm.  I upgraded to Mavericks on 4 seperate computers, an 2 iMacs, MBPro and an MBAir and ALL three no longer connect to Microsoft Office 365 email accounts either with Office 2011 or the built in Mac apps.  Apple support says "Microsoft knew for a year that Mavericks was coming out and it their job to make it compatible".  I repsonded that their own Apps like Mail, Contacts and Calendar don't work either and they attempted to trouble shoot those apps only to no avail after 4 hours and a Mavericks reinstall.  I have also tried an Office reinstall.

Right now I am no where, stuck between two companies who say it's the other guys fault......

I think I've found a solution to the connectivity problem:

Microsoft uses a Root-CA named "Baltimore CyberTrust Root" to sign their office 365 certificates. OS X 10.9 doesn't trust this Certificate by default which seems to cause the exchange-connectivity to fail with an (unrelated) credential error instead of popping up an "invalid certificate" dialog.

The solution then is to trust this certificate manually. This Microsoft KB Article contains further information: http://support.microsoft.com/kb/2842146

I have tried this solution on multiple computer, to no avail.  Mavereicks will simply not work with Office 365 mail accounts.................Frustated by Apple's poor support and lack of solution.

Support - Office.com

Dunno what issues others may have, but as of latest - meaning 10.9.2 - version of Mavericks, I've had no connection issues with OSX, the Office 365 Outlook server and either Outlook 2011 or Apple Mail.

An apparent difference. I did not purchase Office for Mac 2011 via Office 365. I didn't like the 'lease' arrangement of that route.

I just connected to Office 365 the day before this post and after installing 10.9.2. Things may have changed on one or both sides.

While I don't have connection issues, at least for mail and calendar, I am not able to do anything with the Global Address List associated with my O365 account. That's true for both Outlook and Apple's contacts. Outlook works as described - just fine everywhere but in Contacts! Oh, the irony!

Apple contacts just spins it's wheels. One wonders why Apple has contacts as a checkbox for Exchange account syncing. Some might be of the opinion that is misleading - if it don't work, no matter whose fault, don't advertise it. But that's just an opinion some folks might have.

Bottom line, though, in answer to VinMan2999, Mavericks DOES work with Office 365 mail accounts. I have no answers why yours doesn't except, perhaps, because I didn't buy my copy from Office 365.

Update

I did nothing special. Opened Mail.app, added account, picked Exchange, put in username/pw for account. Got the server address from a M$ help page (it is outlook.office365.com) and put that in the server box. Needed to do that for Outlook 2011, too. Then I checked and unchecked what I wanted to use - Mail and Calendar in the Apple Account Preferences.

I believe the newest Mavericks update does talk about fixes in the Mail.app.

I came across this thread while researching Office 365. I am wondering if you are having trouble using the Office apps or is this just an issue with syncing the Office 365 cloud storage and Outlook email? I ask because I don't need Outlook and am not planning on using the cloud storage. I just want to use Word, Excel and PowerPoint.

Thanks!

This worked for me, the certificate needs to be accepteb on "System" to make it work!!