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In addition, when migrating from 2003 to 2010 you have to assign the recipient update service (RUS) to an Exchange 2010 server. Exchange 2010 doesn't use the RUS but failure to do this causes problems. <br />
<br />
You also have to upgrade your recipient policies and address lists to Exchange 2010 otherwise the policies remain read only in Exchange 2010 and can only be edited on Exchange 2003.<br />
<br />
the following guide is worth reviewing just to make sure you have done everything.<br />
<br />
<a href="https://www.simple-talk.com/sysadmin/exchange/upgrade-exchange-2003-to-exchange-2010---part-ii/" rel="ugc">https://www.simple-talk.com/sysadmin/exchange/upgrade-exchange-2003-to-exchange-2010---part-ii/</a>
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In addition, when migrating from 2003 to 2010 you have to assign the recipient update service (RUS) to an Exchange 2010 server. Exchange 2010 doesn't use the RUS but failure to do this causes problems.

You also have to upgrade your recipient policies and address lists to Exchange 2010 otherwise the policies remain read only in Exchange 2010 and can only be edited on Exchange 2003.

the following guide is worth reviewing just to make sure you have done everything.

https://www.simple-talk.com/sysadmin/exchange/upgrade-exchange-2003-to-exchange-2010---part-ii/ [https://www.simple-talk.com/sysadmin/exchange/upgrade-exchange-2003-to-exchange-2010---part-ii/]

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Hi we have recently moved our exchange server from 2003 to 2010, and all the users have their primary smpt address as the domain we have as priority 1 NOT the default address policy. When we initially moved the default one didn't move over so P1 was applied, but now I believe I have moved it over it still isn't updating.<br />
Help!
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Hi we have recently moved our exchange server from 2003 to 2010, and all the users have their primary smpt address as the domain we have as priority 1 NOT the default address policy. When we initially moved the default one didn't move over so P1 was applied, but now I believe I have moved it over it still isn't updating.
Help!

Default address policy exchange 2010

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.