Some versions of Exchange send directory replication requests 5 minutes after the Directory Service starts.
To alter this behavior:
. Upgrade to the latest Exchange Service Pack for your version.
. Use regedt32 to navigate to:
Add Value name Replicator inter site sync at startup as a type REG_DWORD. Set the data value:
0 - Prevents replication at startup.
1 - Replication occurs 5 minutes after Directory Service startup.
Stop and Start the Directory Service for this change to take effect.