Problems with authentication when using associated external accounts

We are using Windows 2003 and exchange 2003. We have a resource forest that holds our exchange mailboxes, the AD accounts relating to the mailboxes are are all disabled. To access the mailboxes we have associated external accounts from another Forest.

The problem we have is that when  the user of the associated external account attempts to access the mailbox they are asked to authenticate. My question is should they have to authenticate or should the associated external account be able to access the mailbox seamlessly? If they shouldnt have to authenticate where would you look to resolve this issue?

Thanks
DeVereGroupAsked:
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Netman66Connect With a Mentor Commented:
Check your Trusts.  They must be in plaee and working.
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mlanasaConnect With a Mentor Commented:
Please go into MMC Snap in Active Directory Domains and Trusts and make sure the trust properties are correct
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