The 150 is sized for around 100 mailboxes with 500 GB of storage. If your team is bigger than that, or you expect to grow past 100 users soon, we'd point you toward the 350 or 850 instead. Talk to a certified rep and we'll size it based on your actual mail volume.

No. Barracuda licenses the Message Archiver by appliance, not by mailbox. One flat cost covers the 150 no matter how many of your 100 recommended users you actually archive, and every feature is included standard, with no add-on modules or per-seat fees.

Both. The 150 archives from Exchange, Office 365, Google Workspace, Domino, and GroupWise, plus Lync and Skype for Business conversations. Most customers are archiving live mail within an hour of racking the appliance.

Backups capture your mail server at a point in time, not a searchable record of every message. They don't give you full text e-discovery search, they mix multiple versions of the same mailbox together, and your end users can't search their own history. The Message Archiver is built specifically for retention, legal hold, and e-discovery in a way backups aren't.

Yes. The 150 includes full text, multi-level search across every archived message and attachment, plus legal hold so an administrator or attorney can freeze exactly the data a case requires without touching the rest of the archive. Every search is logged in the audit trail, so you can show your work if compliance ever asks.