Update - January 4, 2012
Welcome to the new Troubleshooting and Diagnostic Tools wiki. This wiki is work in progress and many updates will be made in the coming weeks. All updates will be called out using this update box. Please check back again soon and don't forget to rate our pages and leave a comment with your feedback. Thank you!

This wiki contains information about tools that you can use to help troubleshoot issues with Office 365. It also contains links to resources such as Microsoft Knowledge Base articles and videos that show how the tools are used to diagnose and resolve specific Office 365 scenarios. You can view the tools in any of the following ways:

Available Views Description
View tools by plan View a list of troubleshooting and diagnostic tools by Office 365 plan (Office 365 for enterprises or Office 365 for professionals and small businesses)
View tools by service View the complete list of troubleshooting and diagnostic tools for each Office 365 service (Exchange Online, Lync Online, SharePoint Online, etc.).
View all tools View the complete list of troubleshooting and diagnotic tools that can be used with Office 365.
View all articles View the complete list of Microsoft Knowledge Base articles that reference the troubleshooting and diagnostic tools that can be used with Office 365.
View all videos View the complete list of troubleshooting videos for Office 365.
View all TechNet Radio episodes and webcasts View the complete list of TechNet Radio webcasts for Office 365.

You can also use the table of contents in the right navigation pane to jump to a specific page in this wiki.