Knowledge Base

Article ID: 2757863 - Last Review: October 27, 2014 - Revision: 36.0


This article contains links to technical resources and support information for troubleshooting Microsoft Outlook connectivity and mobile device connectivity in Office 365.


Cannot connect to Exchange Online by using Outlook

Microsoft Knowledge Base articles
  • 2847916  ( ) How to repair the connection to your Exchange Online account in Outlook
  • 814441  ( ) "An unknown error has occurred" error message in Outlook
  • 2459968  ( ) Outlook 2011 for Mac doesn't automatically set up your email server settings for Exchange Online in Office 365
  • 924625  ( ) When you use Outlook with an Exchange 2007 mailbox, you cannot connect to Exchange 2007, and you receive an error message

Poor performance

Knowledge Base articles
  • 2413813  ( ) How to troubleshoot issues in which Outlook 2007 or Outlook 2010 crashes or stops responding (hangs) when it's used with Office 365
  • 2441551  ( ) Outlook performance is slow in the Office 365 environment
  • 2646504  ( ) How to remove automappping for a shared mailbox in Office 365

Auto Account Setup fails in Office 365

Knowledge Base articles
  • 2404385  ( ) Outlook can't set up a new profile by using Exchange Autodiscover for an Exchange Online mailbox in Office 365
  • 2427141  ( ) You can't find a user in the offline address book in Office 365
  • 2429946  ( ) How to troubleshoot the Outlook Offline Address Book in an Office 365 environment
  • 2710604  ( ) "All Required Authentication Methods could not be found" error message when you use the Remote Connectivity Analyzer tool to test the authentication methods of the specified service in Office 365
  • 2710605  ( ) "Anonymous authentication enabled for virtual directory" error message when you use the Exchange Analyzer tool to send an anonymous HTTP request from the remote server to the URL in Office 365
  • 2710606  ( ) Error message in the Exchange Remote Connectivity Analyzer tool when you test the Outlook Anywhere feature in an Office 365 environment: "Mutual Authentication could not be established"
Help and Microsoft TechNet articlesVideos

Repeated password prompts in Outlook

Knowledge Base articles
  • 2466333  ( ) Federated users can't connect to an Exchange Online mailbox
  • 2637629  ( )  How to troubleshoot non-browser apps that can’t sign in to Office 365, Azure, or Intune 

Cannot view free/busy information in the Outlook calendar

Knowledge Base articles
  • 2555008  ( ) How to troubleshoot free/busy issues in a hybrid deployment of on-premises Exchange Server and Exchange Online in Office 365
  • 2581088  ( ) How to troubleshoot issues that prevent a user from viewing other users' free/busy information in Office Outlook 2007 and in Outlook 2010 in an Office 365 environment

Cannot configure mobile devices

Knowledge Base articles
  • 2427193  ( ) A mobile device can't connect to Exchange Online by using Exchange ActiveSync
  • 2679626  ( ) Your Office 365 email account is not automatically set up on your Google Android device or on your Apple iOS-based device through the Autodiscover service
Tools and Diagnostics wiki articles in the Office 365 Community
The third-party products that this article discusses are manufactured by companies that are independent of Microsoft. Microsoft makes no warranty, implied or otherwise, about the performance or reliability of these products.
Still need help? Go to the Office 365 Community ( website.

Applies to
  • Microsoft Exchange Online
o365022013 o365 gwt guided walk through kbtshoot o365p o365m KB2757863
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