New users cannot access their mailbox  - Exchange 2007/Outlook 2007

cceits
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Currently, I have a domain environment with two DC's/GC's (Server 2008 R2)and two Exchange Servers (Exchange 2003 on Server 2003,Exchange 2007 on Server 2008 R2).  I am migrating all mailboxes from the Exchange 2003 to the 2007, but I am still a ways away from having that complete.  My issue is this.  I have some new users I created and they are getting a "The connection to microsoft exchange is unavailable" message when I try to create their accounts in Outlook 2007.  None of the users I migrated from the old exchange server have this issue.  Autodiscover is working normally as far as I can tell.  I have a feeling this is a group policy problem but I can't be sure.

As a test, I installed Outlook 2010 on a computer and was able to get the new user's mailbox to connect.  Unfortunately, upgrading to 2010 is not a solution because I would need to upgrade all my users to it, since many of them have roaming profiles and I don't want them getting on a machine with 2010, then logging onto a different machine with 2007.. I am sure that would cause problems..

I read somewhere that the issue could be related to the way exchange 2007 handles legacy mailboxes, but again, I'm not sure if that is related to this..

Any help is appreciated!
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Is Office 2007 SP2 or later installed on the affected clients?  I seem to recall SP2 fixing this problem for us a while back.

Author

Commented:
Yeah, Office 2007 SP3 is installed..

Another I was just able to do is, I made a new user, setup their email on the old exchange 2003 server.  I was able to connect their Outlook this way.  Then, after successfully connecting their mailbox, I migrated them to the new mail server.  

I really don't want to have to delete these new accounts and re-create them though...  There has to be a fix.
This can't be an old Exchange requirement to send an email to a new mailbox before it can be accessed?
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Author

Commented:
Not sure.. I find it strange that I can connect the mailboxes in Outlook 2010, but not 2007...
Commented:
OK so, for the new users, I am just moving them to the old mail server, connecting their mailbox in Outlook 2007, then moving their mailbox back to the new server.  This works.  I do have one problem though.

The user that I connected using Outlook 2010, well I can't get their mailbox to connect in Outlook 2007 UNLESS it is on the old mail server.  The second I move it to the new mail server, they can no longer connect in Outlook 2007 (they get the same error originally posted).

Any ideas?

Author

Commented:
Found a workaround

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