Office 365 Content Search Actions and Hard Deletes of Mailbox Items

Office 365 content searches now support a hard-delete (permanent deletion) option for the purge action, but only for mailbox items. You can purge up to 10 items at a go. If you have more to purge, you just have to keep on purging until everything is gone. Or use the Search-Mailbox cmdlet, which keeps on proving its usefulness to administrators who need to remove lots of mailbox items quickly.

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Using Search-Mailbox to Process Multiple Mailboxes

The Search-Mailbox cmdlet is a very powerful weapon for Exchange administrators. It has some quirks, but the Invoke-Command cmdlet helps us get around one, which is how to use a different search query for each mailbox processed in a set of mailboxes.

How to Remove Thousands of Items from an Exchange Online Mailbox

A question asks how to remove a bunch of emails from a shared mailbox. You can use OWA to do the job, especially with its Cleanup Mailbox option, but perhaps some administrative action is needed.