What is the exact reason not to do a Staged Migration from 2010 to office 365 if this works? what issues does this cause?
Also, why would Microsoft just not prevent a Staged Migration to run, if this is not supported?
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It's not really the reason NOT to run a staged migration, just that a cutover migration is a bit more seamless process for end users under a certain amount (MS recommend...), and seems to be the most commonly preferred choice.