I'm currently involved in a migration of an Exchange Server 2003 to Office 365 system. That's quite a big jump (!) as these two systems are separated by more than 10 years of great technical innovations.
We selected the way of a staged migration to mitigate the risks and better manage the end user devices. As you probably know, a single Office 365 licence can be installed on up to 5 devices and we want that our customer can really get value of this benefit.
This project is really interesting and really focussed on customer'strategy for the upcoming years.
The aim of this post is to provide a list of links we found useful during the project.