configure.office.com/sara/SetupE.exe

We are pleased to announce the first public beta of the Office 365 Support and Recovery Assistant is now available. The Office 365 Support and Recovery Assistant helps users troubleshoot and fix their account or profile related Outlook issues. The assi ...

support.office.com/en-us/article/Office-365-Client-Performan...

You can use the Office 365 Client Performance Analyzer (OCPA) tool to identify issues that affect network performance between your company’s client PCs and Office 365.

testconnectivity.microsoft.com

 A set of tools for testing connectivity to you Exchange server.