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Shreedhar,<br />
<br />
Thank you. I added the LegacyExchangeDN of the new user to her new mailbox, but it still resolves to the old user's LegacyExchangeDN. It has been 48 hours since the change. <br />
<br />
Not sure why it is not updating or what to do next.
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Shreedhar,

Thank you. I added the LegacyExchangeDN of the new user to her new mailbox, but it still resolves to the old user's LegacyExchangeDN. It has been 48 hours since the change.

Not sure why it is not updating or what to do next.

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I've got a user who was recently added to AD and Exchange. As fate would have it, she has the same name as someone else. The admin who deleted the old user added the new user the same day. I suspect that instead of creating a new mailbox for the new user, he connected the new user to the old user's mailbox. We began receiving IMCEAEX NDR messages the moment anyone attempted to send her an email.<br />
<br />
So I went with my gut and disabled the mailbox and created the user a new mailbox. We continue to receive IMCEAEX NDRs. It's not the Outlook cache on any client. I viewed the LegacyExchangeDN of the new user in ADSIedit and it is different than the one in the IMCEAEX NDRs. I suspect the old user is being referenced in those NDRs. <br />
<br />
1. Will it resolve my problem if I change the LegacyExchangeDN?<br />
<br />
2. Will it cause potential problems if I do?
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I've got a user who was recently added to AD and Exchange. As fate would have it, she has the same name as someone else. The admin who deleted the old user added the new user the same day. I suspect that instead of creating a new mailbox for the new user, he connected the new user to the old user's mailbox. We began receiving IMCEAEX NDR messages the moment anyone attempted to send her an email.

So I went with my gut and disabled the mailbox and created the user a new mailbox. We continue to receive IMCEAEX NDRs. It's not the Outlook cache on any client. I viewed the LegacyExchangeDN of the new user in ADSIedit and it is different than the one in the IMCEAEX NDRs. I suspect the old user is being referenced in those NDRs. 

1. Will it resolve my problem if I change the LegacyExchangeDN?

2. Will it cause potential problems if I do?

IMCEAEX NDR &amp; LegacyExchangeDN

The Microsoft Server topic includes all of the legacy versions of the operating system, including the Windows NT 3.1, NT 3.5, NT 4.0 and Windows 2000 and Windows Home Server versions.

Microsoft Server OS

Windows Server 2008 and Windows Server 2008 R2, based on the Microsoft Vista codebase, is the last 32-bit server operating system released by Microsoft. It has a number of versions, including including Foundation, Standard, Enterprise, Datacenter, Web, HPC Server, Itanium and Storage; new features included server core installation and Hyper-V.

Windows Server 2008

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.

IMCEAEX NDR &amp; LegacyExchangeDN

IMCEAEX NDR & LegacyExchangeDN