Click one of the following Office 365 services to view a list of troubleshooting and diagnostic tools that can be used for that service:

Service Description
Email & Calendar with Exchange Online This section contains information about tools that you can use to troubleshoot and diagnose Outlook and Exchange Online issues for Office 365.
Enterprise Single Sign-On This section contains information about tools that you can use to troubleshoot and diagnose Enterprise Single Sign-On issues for Office 365.
IM & Online Meetings with Lync Online This section contains information about tools that you can use to troubleshoot and diagnose Lync Online issues for Office 365.
Office 365 for Mac This section contains information about tools that you can use to troubleshoot and diagnose Apple/Mac issues for Office 365.
Office 365 Service Administration This section contains information about tools that you can use to troubleshoot and diagnose Microsoft Office 365 portal and administration issues for Office 365.
Office Professional Plus This section contains information about tools that you can use to troubleshoot and diagnose Office Professional Plus issues for Office 365.
Office Web Apps This section contains information about tools that you can use to troubleshoot and diagnose Office Web App issues for Office 365.
Websites and Collaboration with SharePoint Online This section contains information about tools that you can use to troubleshoot and diagnose SharePoint Online issues for Office 365.