Unable to login to Exchange 2007 mailbox in Outlook 2003

We have just moved some users to Exchange 2007 (on Windows Server STD 2008 x64 bit), and users accessing via Outlook 2003 on Win XP Pro PCs.

1. I had a new user who cannot login (it keeps prompting for domain userid/password), but the userid and password is correct because the user can login using OWA webmail. I have tried removing and adding back the Exchange account in Outlook (via control panel -> mail ) but get the same results.

2. I had another user who is able to login using Outlook 2003 to the Exchange 2007 mailbox, now after rebooting the email server, he is no longer able to login using Outlook 2003 (it keep prompting for userid and password). User is able to login to Owa webamil using the userid and password.

Any suggestions?

Thanks
sidartraAsked:
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AmitIT ArchitectCommented:
I assume version is blocked.

Check this KB
http://support.microsoft.com/kb/924625
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Adam BrownSr Solutions ArchitectCommented:
Your exchange server probably has Encryption enabled. Outlook 2003 doesn't have RPC Encryption enabled by default. Method 2 here: http://support.microsoft.com/kb/2006508 explains how to fix that.
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SISAntCommented:
Quick question as I've came across this problem before, Do you have Exchange upgraded to Service Pack 3?

If you don't I advise you to do it as it resolves A LOT of these types of issues.
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sidartraAuthor Commented:
Hi,

OK thanks for the quick comments.

1. It is not a blocked version. it just keep prompting for the user password , when we use owa, we can login with the same password immediately.

2. It is not encryption issue, it is unchecked. But it still repeatedly asks for password.

3. OK I will try this.

Thanks
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MegaNuk3Commented:
2.) encryption needs to be ticked in Outlook 2003
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Adam BrownSr Solutions ArchitectCommented:
Sidarta, you need to check your Exchange server to see if encryption is enabled, not Outlook. If encryption is enabled on the Exchange server, it must be enabled on the Outlook client.
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sidartraAuthor Commented:
SISAnt: When I try to apply SP3 it says it needs a tool lifife (?) to update AD schema, I applied to command and SP3 was installed successfully and server rebooted. But I still get two users who are unable to login to Exchange - it just keep prompting for the user password and stays offline if you click on cancel on the password prompt.

Meganuk3: I check my Outlook 2003 settings (which can connect to Exchange 2007 server) - mine's not checked for encryot communication between exchange and client, and I am still able to connect so this may not be the main cause.
 
Any other suggestions?
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sidartraAuthor Commented:
here's an update, on my PC, when I remove my own Exchange accoutn and add the other two users (one at a time), I am able to connect to the Exchange server using my PC Outlook 2003.

I checked the PC network settings they are identical - domain, DNS, WINS, Gateway etc any suggestions/comments?
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MegaNuk3Commented:
Check outlook to NTLM auth and not Kereberos
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sidartraAuthor Commented:
Hi all,

Thanks for the quick response.

The problem is resolved, thanks to the Microsoft bug/corruption.

1. There was nothing wrong with the exchange setup.

2. After a detect and repair on MSO 2003 and a scan disk, both Outlook 2003 could connect.

What a nightmare, Microsoft could at least help with some useful error messages or diagnostics.

cheers
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MegaNuk3Commented:
Thanks for the final solution
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