Now it must be time for a Solaris port (Sparc as well as intel/amd 32/64) bit. The package structure is almost alike.
I really believe Zimbra could gain a large market share going Solaris because. A port would eliminates the need for windows and existing Solaris Companies (A large number world wide) don't have to swtich to windows or linux to get an exchange killer.
A positive bieffect is definitely the PR Zimbra will get this way. I believe it will generate a big hype and a lot of IT news postings regarding Zimbra and Solaris.
Even I am not paranoid, sometimes I can't stop thinking if the hesitation is related to the fact the Redhat is the formal owner of the Zimbra Company, and the real cause is to avoid Solaris competition on the collaboration front.
Try to imagine: DTrace, Zones and ZFS as base for a Zimbra installation.
There really can't be a more beautiful scenario for a collaboration suite
Just my thoughts... Best regards Daniel Mersebak