Not much beyond capacity, and that's intentional. Both run the same 2U chassis with RAID-6, ECC memory, and dual power supplies. The 950 simply scales that same redundant design up to 28 TB and around 4,000 mailboxes for organizations that have outgrown the 850's 2,500-user range.

More than the raw number suggests. Single-instance storage removes duplicate messages and attachments across every mailbox, and retention policies can age out or export mail that's past what compliance actually requires. Most customers get years of headroom before capacity becomes a conversation again.

Yes. Retention and content policies can be set at a granular level instead of one blanket rule for the whole company, and role-based search means each team only sees what they're authorized to search, even though everyone's mail lives on the same appliance.

No. Federated search lets you query across the 950 and any older Barracuda archiver you keep running, so historical mail stays searchable while new mail archives onto the 950. You're not forced into a full migration on day one.

Yes. One flat cost covers the 950 regardless of how many of your 4,000 recommended users you're actually archiving, with the full feature set included and no per-seat licensing.