Find Unused Guest Accounts with PowerShell

Given the widespread use of guest accounts within Microsoft 365 to allow external sharing of resources, it’s almost inevitable that some unused guest accounts exist in any Microsoft 365 tenant. Identifying unused guest accounts is a good management practice. If the accounts serve no purpose, why keep them? This article explores how to find unused guest accounts. What you do with them later is up to you.

https://practical365.com/find-unused-guest-accounts/