Removing Email Addresses from Office 365 Groups

Like all mail-enabled objects, Office 365 Groups can have multiple proxy addresses. Microsoft has fixed a bug in the Set-UnifiedGroup cmdlet so that you can remove proxy addresses from groups, but take care before you do.

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Why Search-Mailbox Can’t Remove All Office 365 Content

The Search-Mailbox cmdlet is very powerful when it comes to removing items from Exchange Online mailboxes, but it can’t deal with other Office 365 content.