2429946 How to troubleshoot the Outlook Offline Address Book in an Office 365 environment.2427141 You can't find a user in the offline address book in Office 365.2404385 Outlook can't set up a new profile by using Exchange Autodiscover for an Exchange Online mailbox in Office 365.2646504 How to remove automappping for a shared mailbox in Office 365.2441551 Outlook performance is slow in the Office 365 environment.2413813 How to troubleshoot issues in which Outlook 2007 or Outlook 2010 crashes or stops responding (hangs) when it's used with Office 365.Fix your Outlook email connection by repairing your profile.2459968 Outlook 2011 for Mac doesn't automatically set up your email server settings for Exchange Online in Office 365.Cannot connect to Exchange Online by using Outlook This article contains links to technical resources and support information for troubleshooting Microsoft Outlook connectivity and mobile device connectivity in Office 365.
Office 365: Outlook and mobile device connectivity troubleshooting resources