I recently had the opportunity to experience all of the blood, sweat, and tears of migrating a minimally maintained Exchange 2003 infrastructure to Exchange 2010 (and mid-way through, an upgrade to 2010 SP1). All of the docs out on the web for migrations make it seem soooo easy. But if you are going to do anything other than a single server install and are doing things like, oh say; hardware load balancing, Exchange 2003 co-existence, or working in an old multi-domain forest then you are in for some punishment. I think I ran into every possible issue that you can have with an Exchange 2010 migration. One guide that helped me in this endeavor was the rapid transition guide from Exchange 2003 to Exchange 2010. This guide didn’t cover every aspect for me though, here are a few things that may save you a little bit of hassle. I’ve been meaning to publish this for a while and I have a whole lot more notes from this experience but this is a start.
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