To monitor the health of Office 365 using native tools, you have several options, for example:
- Office 365 service health
- Azure AD Connect
As a starting point for monitoring, navigate to https://status.office365.com/ or follow on Twitter at https://twitter.com/Office365Status.
To see all options, please continue reading the documentation by visiting the website at https://support.office.com/en-us/article/monitor-office-365-connectivity-53cdb60c-a6b2-4848-b3ff-e7b75dc3fd1f.
You can also monitor health using your Office 365 portal at http://portal.office.com.