Office 365 introduced throttling on user connections, which impacts migration performance. The throttling is a per-user limitation that reduces capabilities after more than two connections by a single user (including the <MigrationAdmin> user). With previous versions of Exchange Online, migration throughput rates of 3-5GB/hr per machine were common. But Office 365 throttling reduces typical throughputs to 500MB/hr or less per machine.
Most Office 365 projects therefore require multiple migration machines (or virtual machines) running in parallel to achieve a practical throughput. Use a separate unique <MigrationAdmin> account for each machine, to overcome the limits imposed by Office 365 throttling. Also, each migration machine should be configured with fewer threads (2–4) to optimize throughput. More migration machines are therefore required for Office 365 migrations to achieve throughput rates comparable to those for other target platforms.
Also, migration to Office 365 uses the Internet to transport data, which is typically slower and less reliable than local network connections. Migrator for GroupWise offers several performance parameter settings that can minimize timeouts when data transmissions encounter network delays. These parameters are explained in the Pre-migration preparations below.
Provisioning Office 365 from a local AD by Microsoft DirSync permits what Microsoft calls single sign-on, or identity federation, so your users can access Office 365 services with the same corporate credentials (user name and password) they already use for your existing local AD.
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