Understanding Migration Concurrency

A common source of confusion for customers using MRS and Migration Service to perform migrations into Exchange Online is migration concurrency.  The most basic definition of migration concurrency is the number of moves that are allowed to run at the same time against a particular migration endpoint. It makes sense that all on-premises environments are…

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It’s always the Load Balancer

Ok, this is probably an (intentionally) inflammatory title, but in this case, it’s absolutely true. A common Exchange Online migration issue we see is the SourceMailboxAlreadyBeingMovedTransientException which I previously blogged about.  One of the most common reasons we see for this error is a communications error (found using the command in the previous blog) that looks…

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