Exchange Server 2003 - Outlook asking for password

HI,
I have just replaced our exchange 2003 server (member server) and now the users on site are being asked for Usernames/passwords when they open Outlook.....Why has this happened?

Thank you
minniejpAsked:
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boho2112Commented:
Is the new server configured the same as the old server?  Does the other Exchange server still exisit?  Is this a front-end/back-end configuration?  Are the users that are being asked for creditials on the Lan or using Outlook Anywhere(RPC over HTTP)?
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minniejpAuthor Commented:
Thank you for your reply.  Yes the new server is configured the same way as the old one.  Yes the other Exchange does still exist but will be removed soon.  Its a back-end config and the users are on a LAN accessing their emails via Outlook.
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boho2112Commented:
So is the new server replicating the backend exchange mail boxes?  If not you need to get it replicating Exchange between the 2.

Is SP2 installed on the front-end? How about the back end?  The replacement server needs to be the same, and should have SP2 installed on all 3 for maximum compatiability.
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minniejpAuthor Commented:
Sorry, its not a DMZ its a multiple domain environment with an Exchange server in each domain.  The domain in question is a member server.  I have replicated all Public folders from the old server to the new one and have removed all mailboxes and changed the Receipent Update Services.  I turned off the old exchange to see if anything fell over - now the users are being asked for passwords.. They have entered their password and haven't been asked for it again.
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boho2112Commented:
So then you are good now?  It's not asking for passwords every time they open Outlook?
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minniejpAuthor Commented:
I think it has stopped, I will get back in touch should it happen again.  THanks for your help
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