Update - December 12, 2011
Welcome to the new Troubleshooting and Diagnostic 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 section contains information about troubleshooting and diagnostic tools that can be used with Office 365. You can view the troubleshooting tools and diagnostics articles in any of the following ways:

Available Views Description
View Tools by Plan Type Access this section to view a list of troubleshooting and diagnostic tools for each specific Office 365 plan type (Office 365 for enterprises or Office 365 for professionals and small businesses).
View Tools by Service Access this section to view a list of troubleshooting and diagnostic tools for each Office 365 service (Exchange Online, Lync Online, SharePoint Online, etc.)
View All Tools Access this section to view the complete list of troubleshooting and diagnotic tools that can be used with Office 365.
View All Articles Access this section to 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 Access this section to view the complete list of troubleshooting videos for Office 365.

You can also use the table of contents located in the right navigation menu to jump to a specific page of the troubleshooting and diagnostic tools wiki.