Exchange Online archiving and litigation hold

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Exchange Online archiving and litigation hold

How Exchange Online keeps mail beyond the primary mailbox — archive mailboxes, retention, and legal hold.

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What is an archive mailbox?

A second mailbox attached to the user, shown in Outlook as Online Archive, where retention policies move old items to keep the primary mailbox small. It is 50 GB on Plan 1, 100 GB on Plan 2, and unlimited (1.5 TB) with…

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What is the difference between litigation hold and retention?

Litigation hold preserves everything in one mailbox until released; a retention policy preserves or deletes by rule across many mailboxes. Litigation hold is the fast per-person legal action; retention policies are the…

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Does the archive count against the mailbox quota?

No. The archive has its own quota. Items moved by retention tags (default: move to archive after two years) leave the primary mailbox's quota, which is the point.

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