Question : You have a previous version of the Microsoft Exchange Messaging Service. Create a new profile.

I manage a SBS 2003 with 4 Workstations which happen to have a mix of Outlook 2007, 2010 clients. We use Roaming Profiles to allow a User who wants to use any computer to be able to sit down at any PC and logon and not worry about settings etc.

When User1 logs onto PC1 with Outlook 2010 and launches application, checks email and logs off. If User1 then goes to PC2 with Outlook 2007, the profile from server is used and User1 then receives series of error messages as below:
"You have a previous version of the Microsoft Exchange Messaging Service. Create a new profile."
"The mail profile 'Outlook' was created with a newer version of Outlook and might contain information that is not compatible with your current Outlook version. If you experience problems with this profile ....."
"Cannot open your default e-mail folders. The information store could not be opened."

I have searched the forums, but the old reinstall Office or re-create a Users Outlook Profile simply fixes the issue until the above scenario happens again.

Is there something that is not compatible with 2007/2010 that would stop a mixed environment? Mr Microsoft, come on?

The below EE thread does not resolve my issue.

http://www.experts-exchange.com/Software/Office_Productivity/Groupware/Outlook/Q_26300795.html

Answer : You have a previous version of the Microsoft Exchange Messaging Service. Create a new profile.

The problem is specific to running with roaming profiles and is not restricted to Microsoft. You can't roam from a machine running Quickboox 2005 to a machine running Quickbooks 2008 and expect to open the same data file without issues.

In short, either don't have roaming profiles, or standardize on a platform. That has always been a rule of roaming profiles while you can "break" that rule from time to time, it isn't recommended and it shouldn't be expected to work. In this case, Outlook 2007 and 2010 are significantly different (Outlook 2010 allows multiple Exchange accounts for example) so of course the profile data is a different format; an absolute requirement to support new features.

-Cliff