HKLM\SOFTWARE\Microsoft\MSMQ\Parameters\
The Migration subkey stores entries that determine how Message Queuing data is propagated to clients running previous versions of the operating system. Entries in the Migration subkey are used only when there are MSMQ 1.0 MQIS servers running Windows NT 4.0 and earlier. They are not used when all servers are running Windows 2000.
Note
Message Queuing does not add this entry to the registry. You can add it by editing the registry or by using programs that edit the registry.