re: Google Apps To Microsoft Office 365: 10 Lessons
Great article and thanks for sharing your experience. I too ran into the same problem that you did early on in my learning of how to migrate users to Office 365. Namely the issue where your email address is in use as both a Windows account and as an Office365 email address. Before setting up my own Office365 subscription, I had my custom Domain hosted at a major ISP. My email address had been in use for years and I intended to keep using it once I migrated my custom Domain to Office365. I also happened to have had a Microsoft account that was setup using this same email address. This presented the problem you highlighted because Office365 setup using my custom Domain created a new O365 account with that same email address as well. The Office 365 account is completely different from the Microsoft account and will cause confusion to many users who are unaware of this distinction and its impact on working with the two Microsoft signons for their online services.
Microsoft needs to somehow address this issue because I'll bet it comes up often.
Other than that, I am glad you like Office 365. It has turned out to be one of the best products that Microsoft has created and it is only getting better.