Existing AD Users missing when adding names to Exchange 2010 Server

In Exchange 2010 EMC | RECIPIENT CONFIGURATION | MAILBOX

Create New Mailbox | USER MAILBOX | EXISTING USERS | ADD

Displays some of the older AD users, but not any users that have been added in the last month (or more).

Only way to fix this is to use AD Users & Computers on the Exchange 2003 Server | Pick the Name | EXCHANGE TASKS | DELETE EMAIL ADDRESS

Once that's done, the new user will appear on Exchange Server 2010 as a selection for new mailbox.

Same thing for Contacts created in Exchange 2010.  Unless I go to the Exchange 2003 Server | EXCHANGE TASKS | Create mail address, users will not receive messages for groups of which they are a member.

Hopefully this sounds familiar to someone . . . .

Thanks!
NEMCAsked:
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James NewportCommented:
Isn't Exchange 2003 EOL?
NEMCAuthor Commented:
It's the legacy server that isn't routing any mail, but it hasn't been uninstalled.  I'm concerned about uninstalling until I can fix the issue with new users.
Amit KumarCommented:
I think when you are creating user in ADUC you may be enabling e-mail for Exchange 2003.

Please use Exchange 2010 EMC to create new user or use ADUC on Exchange 2010 server only.
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NEMCAuthor Commented:
We are using ADUC on Server 2008R2 and attempting to add the mailboxes on Exchange 2010 Server.  Only going back to the 2003 Server because that's the only way to modify newly created users so that Exchange 2010 will list them when we attempt to create a mailbox.
Amit KumarCommented:
So try creating new user from EMC that is a better idea. dont enable mailbox for existing user.
NEMCAuthor Commented:
That does work correctly, so partial credit for that.  Thanks.

I am still concerned that the other functionality is not working correctly.

In addition, I can't create mail enabled Contacts using the EMC, so that remains an issue.
NEMCAuthor Commented:
I'm guessing at least part of the problem lies with the automated tool they use for creating network accounts.  It uses DSADD USER.  Is that still supported?
Amit KumarCommented:
DSADD is still supported. seems someone has created a script where it is creating mailbox in Ex 2003. Better you avoid that tool and create manually in ADUC. On the other you have confirmed that when you have deleted Ex 2003 mailbox then you are able to create mailbox in EX 2010 for existing user so it is clear that script or tool is culprit

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NEMCAuthor Commented:
I will assume that the DSADD routine is causing the issue and close the case.

Thanks!
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