I suspect no! I see no way to do that in Outlook. The Connector make his own Outlook profile. If you create a new profile, the Connector will ignore it.
At the utmost, you can do that with two Windows Users.
If you use Thunderbird, you can connect Zimbra (also zwo Accounts) on IMAP.
In Zimbra 5, you've Mailbox shareing, but I've never tested!
On Apple Computer you can define more than one Account for the synchronisation with iCal. |