Exchange 2010

I am moving my users to a new Domain and a new Exchange Server 2010 Server and I am wondering what will happen with the NK2 file for the cached entries for the staff within the old domain. Obviously, when the users are moved to the new domain, the NK2 file will be pointing to the old domain/exchange server and they will receive a bounce back stating that they do not exist.  Is there an easy way to work around this?

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Zacharia KurianAdministrator- Data Center & NetworkCommented:
First of all any internal names that point to your old domain wouldn't work but any thing that points to other external domains will work.

Either you have to instruct them to manually delete those internal caches from their outlook or you may have to use a 3rd party tool that would help you/user to delete the internal names at one go and save it (NK2) with only external names. Find the below link for more details;

Amit KumarCommented:
I think article will help you to resolve it, but I found only this workaround as per situation.

Let’s say that you want to represent John Doe, who has a mailbox in Organization B, in the GAL for Organization A. You create distinct SMTP namespaces for the two organizations, create SMTP connectors with the appropriate namespaces, and you test mail flow between the two. Everything works fine, and so you create contacts in the GAL for Organization A to be able to send e-mail messages to those recipients in Organization B.

and if you are using Outlook 2010 or 2013 then follow this article may help you in a better way
Zacharia KurianAdministrator- Data Center & NetworkCommented:
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minniejpAuthor Commented:
Some of my users use the NK2 file to store their contacts (yes, unfortunately they do even though they are warned), so I don't want to completely delete its content.  Is there any way of modifying it automatically ( I know this might seem odd but thought I would ask) that will just remove the internal folk (so the users can just use the GAL  and build up their internal cached contacts again) but keep the external folk....or is there anything that can be done to point the existing internal contacts on the NK2 file to the new users in the new domain (adventurous I know).

Zacharia KurianAdministrator- Data Center & NetworkCommented:
Have you looked into my 2nd post where a similar issue found in EE? If not check that one and see the post by @ckeshav  as the accepted solution.

Or you could try the link provided on my 1st post.

minniejpAuthor Commented:
Thanks Zac I knew about this, however we have approx 300 users and I wanted to see if there was a quick way of doing this rather than having to edit each users attribute?
Zacharia KurianAdministrator- Data Center & NetworkCommented:

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minniejpAuthor Commented:
Great thanks
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