Capacity. The 650Vx scales to 8 TB and around 1,200 mailboxes, double the 450Vx's 4 TB and 600 users. Deployment platforms, RAID options, and licensing stay the same across both.

Yes, continuous Energize Updates and Instant Replacement subscriptions apply to the 650Vx as well, since they cover firmware, security updates, and support rather than physical hardware replacement. Your quote from a certified rep will include what's required.

It can, but performance depends on the host it's running on. At this mailbox count, most customers allocate dedicated CPU and memory to the 650Vx rather than sharing a host with unrelated workloads, the same way they would for any production database or mail server.

Often, yes. With room for around 1,200 mailboxes, one 650Vx can consolidate what a few smaller appliances were handling, and federated search still lets you query older archivers you keep running during the transition.

Yes. One subscription covers the 650Vx no matter how many of your 1,200 recommended users you're actually archiving, with no per-mailbox charges layered on top.