The Office 365 Tools and Diagnostics site provides a comprehensive list of tools to diagnose and troubleshoot O365 services across all plans/subscriptions.
Prior to migrating mailboxes to O365, I use MessageOps Office 365 Client Updater to ensure machines with Windows 7 and older, and Office 2010 and older have the prerequisite software and updates installed for compatibility with O365 resources. I deploy the updates via group policy (GPO).
For older Office 365 implementations using older versions of DirSync (that do not include password sync), I have used MessageOps Office 365 Password Synchronization Tool to sync passwords to O365. It works the same way that the newer versions of DirSync with Password Sync do.
If you need to import PST files into Office 365, don’t bother with the Microsoft’s PST Capture tool. Instead, use MessageOps Office 365 Exchange Migration Tool. Though the tool requires licensing, it is far superior in reliability and migration speed than PST Capture.
The IdFix DirSync Error Remediation Tool helps with identifying on premise user accounts that likely will not sync to Office 365 for easy and quick remediation.
Microsoft’s Remote Connectivity Analyzer (aka ExRCA) is the Swiss Army knife (if you will) to test and troubleshoot connectivity issues with Exchange, Office 365, and Lync as well as analyzing message headers.
To test free/busy in an Exchange Hybrid environment, I will use the Hybrid Environment Free/Busy Troubleshooter.
In planning for an Exchange hybrid configuration, we can request a free site. The hybrid key can be used to incorporate an Exchange 2010, 2013, or 2016 server into our environment. However, the license agreement states mailbox cannot be hosted on a server with a hybrid product key–hence the reason for the key being free. In my experience with Exchange 2013, I have seen in some cases where the mailbox cmdlets are not available. The hybrid configuration acts as the bridge for migrating mailboxes from legacy versions of Exchange (2003, 2007 or 2010) to Office 365 to provide a seamless experience for the end user. NOTE: Access to the hybrid key distribution site requires IE9 or newer, Windows 7 or newer, and .NET Framework 3.5.key at the
These 3 sites are a veritable “one stop shop” of useful links to O365 resources…
- MessageOps Office 365 Links have almost every imaginable link available.
- The guided walkthroughs for Exchange, Lync, SharePoint, and Office 365 are a must.
- The Office 365 Community Tools and Diagnostics are as well.