HI I have a problem regarding to creating a new Address list when I create a new address list that include the Mailbox users I got the following error Exchange Management Shell command completed: new-AddressList -Name 'Global List' -IncludedRecipients 'MailboxUsers, MailGroups' -Container '\' Elapsed Time: 00:00:00 Apply Global List Completed Warning: Failed to update recipient "Domain.com/Users/User1". The following exception occurred: Active Directory operation failed on dc1.Domain.com. This error is not retriable. Additional information: The name reference is invalid. This may be caused by replication latency between Active Directory domain controllers. Active directory response: 000020B5: AtrErr: DSID-03152392, #1: 0: 000020B5: DSID-03152392, problem 1005 (CONSTRAINT_ATT_TYPE), data 0, Att 90284 (showInAddressBook) . Warning: Failed to update recipient "Domain.com/Group/Global/Manager". The following exception occurred: Active Directory operation failed on dc1.domain.com. This error is not retriable. Additional information: The name reference is invalid. This may be caused by replication latency between Active Directory domain controllers. Active directory response: 000020B5: AtrErr: DSID-03152392, #1: 0: 000020B5: DSID-03152392, problem 1005 (CONSTRAINT_ATT_TYPE), data 0, Att 90284 (showInAddressBook) What is this Note that the replication is working Fine and I check it using the Repadmin and no problem and also FRS eventlog has no problem I check th valuw ShowInAddressBook and I found that it have the Global address list and the All users lists path so what is the problem Thanks