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did you change the DNS addresses to the new DCs in exchange2003 network settings?
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did you change the DNS addresses to the new DCs in exchange2003 network settings?

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In Exchange System Manager, expand Servers, right-click your Exchange server and then click Properties.<br />
<br />
Click the Directory Access tab.<br />
<br />
In Show, select Global Catalog Servers.<br />
<br />
Check the Automatically discover servers check box<br />

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In Exchange System Manager, expand Servers, right-click your Exchange server and then click Properties.

Click the Directory Access tab.

In Show, select Global Catalog Servers.

Check the Automatically discover servers check box


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I did not find any update on this question, please close it considering the same.
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I did not find any update on this question, please close it considering the same.

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After upgrading to windows 2008 R2 domain, our exchnage 2003 server still look for old GC server which was a old DC also, and gives error in application event log as Event 8260. We do have both our new windows 2008 DCs are mrked to be as GC but exchange still look for old. Is there any chnages need to be perform at exchnage level while upgrading of domain or after then?
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After upgrading to windows 2008 R2 domain, our exchnage 2003 server still look for old GC server which was a old DC also, and gives error in application event log as Event 8260. We do have both our new windows 2008 DCs are mrked to be as GC but exchange still look for old. Is there any chnages need to be perform at exchnage level while upgrading of domain or after then?

Exchange server try to look for old GC

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.