When you connect to Microsoft Exchange Online in Microsoft Office 365 over Microsoft Exchange ActiveSync, your Office 365 email account is not automatically set up on your Google Android device or on your Apple iOS-based device (such as an iPhone or an iPad) through the Autodiscover service. Also, you cannot access your Exchange Online mailbox from your mobile device.
When this problem occurs, you may also receive an error message that resembles the following:
Unable to connect to server
This error message can vary depending on the device that you use.
This problem occurs if the mobile device does not fully support certain Exchange ActiveSync protocol requirements for redirection.
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
For help in setting up email for your mobile device and the current version of Office 365, go to the following Microsoft website:
Phone and tablet setup reference
For more information about this problem and about how mobile devices connect to Exchange Online in Office 365, see Exchange ActiveSync client connectivity in Office 365
Devices that are part of the Exchange ActiveSync Logo Program support redirection and do not experience this problem. For more information about the Exchange ActiveSync Logo Program, see Announcing the Exchange ActiveSync Logo Program
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