We're in full swing (well mostly) with our new CloudExchange service that offers Hosted Exchange 2010 mailboxes for companies of all sizes from a single mailbox to thousands. Current pricing for CloudExchange 2010 is as follows:

$9.99 per mailbox per month
Unlimited Disk Space
Unlimited Email
Online Web Access (OWA)
ActiveSync
SPAM Protection
AntiVirus Protection
Nightly Mailbox Backups
Online Mailbox Control Panel
Archiving (option)

As well as a few more features. We'll use this thread to keep updates on this service as more information becomes available. Contact us if your interested.