Also you can purchase perpetual licensing if you check with a sales rep. My company has no problem paying for year support, but they did not want to pay for software we did not own. I mentioned that and the perpetual licensing option popped up quickly. We still pay for support seperately though.
Mail | Dell 2950III | 2x Quad Core 5420 | 8gb RAM | 6x 146gb SAS RAID 0+1 | Red Hat 5.3 | Zimbra 6.0.10 Network Edition
Test | VMware ESXi Whitebox | Phenom II Black 3.2ghz | 12gb RAM | 6x 1tb SATA RAID 0+1 | CentOS 5.4 | FOSS, Not in use now