Our Sever installed Backup Exec Version 8.0 Rev.3315
It include Models:
1. Server Editon
2. Agent Accelerator for windows Nt /2000( total 6)
3. Agent for lotus Domino

Now we want to Upgrade to 8.6 Verion ,and want it can backup
Microsoft Exchange 5.5 (lotus will be not used any more)

My question is how to upgrade?

Whick Models we should buy ?