Microsoft today released a new tool that would help you in the time of Office 365 support issues. This new called Support and Recovery Assistant for Office 365 is an easy-to-use app that asks you some simple questions, tests for some of the most common Office 365 support issues and attempts to implement resolutions on your behalf.
Right now, this tool focuses only on common scenarios people encounter with Outlook, but it will gain new troubleshooting and resolution capabilities in the future. This tool is built to automatically update itself as these new capabilities become available.
You can install the Support and Recovery Assistant by visiting diagnostics.outlook.com.