Hello,

I created bulk distribution lists using the following attributes:

  
name sAMAccountName groupType mail targetAddress proxyAddresses msExchAdminGroup mailNickName displayName managedBy

  
However, when we added more managers in exchange, we received the following message:

"To save changes on object "", the object must be upgraded to the current Exchange version. After the upgrade, this object cannot be managed by an earlier version of the exchange management Tools. Do you want to continue and Upgrade?"

When we clicked Yes to All, we get the following error message:

Error: The proxy address "" is already being used by domain/OU/Object. Please choose another proxy address.

We were able to do it before using ADManager to create mail-enabled distribution groups and I can confirm that no changes have been made to AD/Exchange.

Please advise.

Thanks!