Office 365 applications create lots of Azure Active Directory guest accounts. Here’s how to find old accounts and check their Office 365 group membership. If you know the accounts that are old and stale and aren’t members of any Office 365 group, you can consider removing them from your tenant.
The Office 365 Admin Center includes reports of licenses assigned to users. The same information can be extracted with PowerShell, which means that you can analyze license assignments anyway you wish. The script is quick and easy, mostly because its error handling is non-existent, but it’s enough to get going.
It used to be more difficult to generate a report about the storage used by OneDrive for Business sites in an Office 365 tenant. Now it takes just a few lines of PowerShell. Here’s an example of a simple but powerful script to do the job.
Some Exchange Online mailboxes are quite small (2 GB for frontline users). Tenant administrators might want to monitor mailbox usage to make sure that quotas aren’t unexpectedly exhausted. This post explains how to use a PowerShell script to calculate the percentage of mailbox quota used and highlight the problem if a threshold is passed.
Microsoft has announced that basic authentication for multiple email connection protocols won’t be supported after October 13, 2020. You won’t be able to connect with EWS, EAS, IMAP4, POP3, or Remote PowerShell unless you use modern authentication. There’s just over a year to prepare, but there’s some work to be done.