Welcome to the forums.
The migration wizard is only for Exchange 2003 I'm afraid. You could use IMAPSYNC and other tools to get the info into Zimbra. You should have no problem with that quantity of email. Zimbra can run on Ubuntu - it must be the Ubuntu 6.x LTS version for NE.
You'd have to confirm pricing & licences with sales but the minimum is 25 user licence.
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Regards
Bill
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