Outlook 2010 Cache issue -- Exchange 2010

We had a request to Set- up an email address for a new starter. We created it. Next day one of my smart colleague decided to delete user account from AD. To cover it up he recreated an account with the same name.
Now the problem we have is for the users who have cache enabled in outlook, cant send an email to new user. They are getting  error message "The e-mail address you entered couldn't be found."
 Users who don't have cache enabled can send it.
It has been more than two days we still have the same problem. Can you please assist in fixing this issue?
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This is because Exchange System is trying to deliver mail with old legacyExchangeDN attribute. This can be fixed by adding this value as a X500 address to the new mailbox. There will be a string in the following format in the error message users are getting.


You need to convert this string into a legacyExchangeDN by removing IMCEAEX- and replacing
_ to /
+20 to SPACE
+28 to (
+29 to )
+2E to .

If we work on above string, we will get legacyExchangeDN as


Now this should be added as X500 address to the new mailbox from the Email Address Tab of user properties.
Guy LidbetterCommented:
Or get the users to delete the cached version of the users email address :-)
Will SzymkowskiSenior Solution ArchitectCommented:
Next day one of my smart colleague decided to delete user account from AD. To cover it up he recreated an account with the same name

The correct approach for recovering the active directory account would be to use the ldp.exe. When AD Accounts are deleted, they are in the deleted items container for 60 days (2000/2003) and 180 days (2008/2012) until they are tombstoned. Before it reaches the tombstone period you can recover the AD Account from the hidden Deleted Items Container.

This entire issue could have been mitigated if the AD Account was properly restored and mailbox reattached.

See below link for details on how to accomplish this.


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ukitsmeAuthor Commented:

Tried it. Didn't work.
Guy Lidbetter,

Sorry that is not a solution. We sent an email to all users across globe to do it, but we still get emails telling they are getting error message when they send emails.


I know that it the way to do it, but tech already created a new mailbox and restored emails from backups
ukitsmeAuthor Commented:
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