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(!) Solutions for the most common issues with Outlook are listed below. To help identify and solve your issue, try the Outlook connectivity troubleshooter, the Office 365 Best Practices Analyzer for your PC or the Mail Flow Guided Walkthrough.
There are a few things that can cause issues. The most common cause seen by Support is an outdated operating system or software, so you should check that first. If that meets requirements, continue to go through the steps below in order. Test your Outlook connection between each step. If you've completed the steps below and are still having issues, post the details of your situation to this discussion in the Email and calendar forum.
Important: If your tenant is being upgraded, it may take over 48 hours to complete that upgrade. If you have questions about your upgrade, see Office 365 Service Upgrade Center for Enterprise or Office 365 Service Upgrade Center for Small Business. If you have questions about what to expect while your tenant is being upgraded, read the Guide to the Office 365 Service Upgrade for 2013.
For more details on how to repair your Outlook profile including instructions for other Outlook clients go to
Use the Microsoft Remote Connectivity Analyzer to test Autodiscover for your account. If you have repaired your Outlook profile and are still experiencing issues, administrators can follow the directions in this link to correct the Autodiscover DNS settings. If you need help with this diagnostic tool, you can read more about how to use it for troubleshooting email problems here.
Have you tried the Outlook connectivity troubleshooter? This tool can help guide you through diagnosing and resolving Outlook issues. You can also run the Office 365 Best Practices Analyzer for your PC
If you have completed the steps above, but are still experiencing connectivity issues with Microsoft Outlook, please contact Support.
To submit a new service request or to find a phone number for your country or region, sign in to Office 365. On the Admin Overview page, on the left pane, under Support, click Overview.
Have you tried the Outlook connectivity troubleshooter? This tool can help guide you through diagnosing and resolving Outlook issues.