Tools for troubleshooting Outlook autodiscover

In my post last week about Office 365 and proxy servers, I mentioned issues with Outlook autodiscover.  These were not exactly easy to troubleshoot, often with multiple subject matter experts looking from different angles (network, client applications, Exchange, firewalls, etc.). During the process, we used a few tools (as well as examining the traffic hitting the proxy servers) and I thought I’d highlight them here (if only for my own future reference):

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