We have an outsourced IT company helping us with something outside the scope of the Office 365 migration and they are pushing us (or really my boss) to give them that business as well. I think its something that is relatively easy (having experience doing a migration from 2003 to 2010) and want to keep them out of it, but they are claiming that people have all kinds of issues with this and its really difficult, you need people with expertise, ect ect.
Long story, but can anyone tell me some of things you might run into with a cutover migration. Just to give me some ammo with these guys.
Thanks in advance.