Finding Hidden Mailbox Archive Growth in Microsoft 365
Microsoft 365 mailboxes hit the 50 GB limit without warning. How I found hidden archive growth and built a PowerShell report to catch it early.
Blog / Category
Microsoft 365
Exchange Online, mailbox archiving, Outlook and Teams quirks, and the admin side of Microsoft 365.
4 posts
How to set up Microsoft 365 archive policy
Keep Exchange Online mailboxes under quota: enable archive mailboxes, then create MRM retention tags in Purview or PowerShell to archive after 3 years.
Outlook and Teams open links on Microsoft Edge
Stop Outlook and Teams from opening links in Edge regardless of your default browser: set the BrowserChoice registry value under Office\16.0\common\links.
Autodiscover Ignores Exchange Online? Check the Registry
Outlook asks for Office 365 credentials while the mailbox is still on Exchange on-premises: set ExcludeExplicitO365Endpoint under the Autodiscover key.