Hi,I have already checked with adsiedit, but dont know really what attributes may causing the problem, however it is intringuing that in the following of the NDRO= and CN= does not show the organization name and administrative group name but these weird values : IMCEAEX-_O=NT5_ou=F126F20235F5014DA4DFF3122D44AA06_cn=2B8AB1EAFC795348A0545DA094CEF3E2@siege.acscContext : migrating from one Exchange 2007 SP1 to another Exchange 2007 SP2, The Exchange 2007 SP1 isshut downbut not uninstalled yet.Have you any clues about how to troubleshoot this problem ?Thank you

THese are for external mail-enabled contacts?Were they recreated? How are you "migrating" to another server?

Please check the proxyAddresses attribute of the problematic contact The issue would occur if the address policy has been disabled on the contact. Please run the cmdlet below to enable address policy on the mail address, apply the address policy, and then force a rebuild of OAB Get-MailContact -OrganizationalUnit OU=Internal,OU=Contacts,OU=Microsoft Exchange Objects,DC=b-f,DC=net | Where {$_.EmailAddressPolicyEnabled -eq $False} | Set-MailContact -EmailAddressPolicyEnabled $True

Any update?

Hello, I am waiting for our customer feedback, He was instructed to run the powershell command on his contact OU.I will keep you informed.

thank you, your solution also fixed my problem

this fixed the issue but what exactly was the change doing so is my curiosity..