Email From Mediatemple, (mt) mail, which itself is based on Atmail
You could get a Cloud Based version of Atmail from atmailcloud.com/
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This looks pretty interesting though I had to sign-up to figure out what they offer exactly (for 2 USD/user/month):
* 10GB storage * Webmail * POP3/IMAP * Calendaring * Groupware * Mobile Sync