So bottomline, Office 365 Migrations are not simple cookie cutter processes that someone can just "wing-it" over a weekend, but to do it right, have someone with deep rooted expertise in Exchange, Office 365, archives, security, DNS, storage, firewalls, proxies, networking, Autodiscover, Active Directory, AD FS, DirSync, PowerShell, client app packaging, pushing out policies to endpoint clients, mobile device management expertise, ActiveSync policies expertise, etc.
Anything short of someone knowing this and a lot more, a migration can come to a halt, many times during the middle of a big migration weekend, and then someone needs to unravel what was done, potentially redo stuff from scratch, and get the process going forward, as it likely should have been done in the first place.
Handful of thoughts here, hopefully this will help you identify things in advance of your migration to Office 365 and be better prepared in the process!!!
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