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Implementing a Litigation Hold in Office 365


Microsoft 365's Core eDiscovery tool allows litigation holds to be placed on Outlook mailboxes; SharePoint; OneDrive; and Teams accounts. You can avoid adding the URL of each OneDrive site, and adding mailboxes one by one, by making use of a PowerShell script posted on the Core eDiscovery reference guide here. For a selected domain, the script can use email addresses to locate mailboxes. Up to 1000 different email addresses can be used.

The script prompts the admin to enter a search query. The hold can be limited to data that meets particular search criteria.

It's necessary to create a text file with a list of email addresses the script will process.

The script generates logs of the locations of mailboxes and OneDrive sites that are on hold and are not on hold.


Sean O'Shea has more than 20 years of experience in the litigation support field with major law firms in New York and San Francisco.   He is an ACEDS Certified eDiscovery Specialist and a Relativity Certified Administrator.

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The views expressed in this blog are those of the owner and do not reflect the views or opinions of the owner’s employer.

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