Messaging gateway 10.0.1-2 work on the ESX platform

So I currently run 9.5.3-3 on VMWare, ESX 4.1, and there are several updates available. The latest is 10.0.1-2, which upon reading the release notes from this link:

http://www.symantec.com/business/support/index?pag...

States VMware ESXi/vSphere 5.0/4.x.  It does not specifically state ESX (only ESXi).  Is this a typo, or am I indeed out of luck?

If it now only supports the ESXi version, then what is the last version I could have upgraded to?

Thanks,

James