Message Queuing Down-level Client Support cannot operate in mixed mode. Mixed mode is a transient mode in which Message Queuing ...

Message Queuing Down-level Client Support cannot operate in mixed mode. Mixed mode is a transient mode in which Message Queuing deployment is in the middle of migration from MQIS (for MSMQ 1.0) to Active Directory Domain Services. In this mode, some sites are still Windows NT 4.0 sites and are mastered by the PEC and PSCs. Mixed mode might require creating/deleting/updating objects that belong to Windows NT 4.0 sites. These operations are not supported by Message Queuing Down-level Client Support. After completing the migration of all Windows NT 4.0 sites to Active Directory Domain Services (migration of the PEC and all PSCs in Windows NT 4.0 sites), Message Queuing will no longer be in mixed mode.