Can Zimbra Do This For Me?

[Baylink]

We're looking implementing for over 225 000 email accounts for users that would be browsing over the desktop/laptop browser.
And just about 100 000 push email accounts for our mobile email users.
we have 12Terabytes storage space.

In my not-so-humble opinion, you are up into territory labeled "hire someone who has experience in large Zimbra rollouts and be prepared to pay him something decent".

You're clearly looking at a cluster solution, but it could be anywhere from 6-50 boxes, depending how much email and how long sessions you're going to get.

Are you doing this with something else now? Do you have dimensioning info from that?

[Baylink]

Did you ever do anything? :-)