https://www.techtarget.com/searchwindowsserver/definition/Microsoft-Exchange-Mailbox-Replication-Service-MRS
What is Microsoft Exchange Mailbox Replication Service (MRS)? | Definition from TechTarget
This definition explains the meaning of Microsoft Exchange Mailbox Replication Service and how administrators can configure the feature to minimize disruptions.
microsoft exchange mailboxwhat isreplication servicemrsdefinition
https://learn.microsoft.com/en-us/previous-versions/office/exchange-server-2007-technical-articles/cc540452(v=exchg.80)?redirectedfrom=MSDN
Exploring Windows Mobile 6.1 and Exchange ActiveSync Mailbox Policies | Microsoft Learn
windows mobilemicrosoft learnexploringexchangeactivesync