Microsoft Blogs About Its Migration Tools
Microsoft have always had the most extensive migration options, and these keep getting more robust. It also had some software partners providing 3rd party options for smooth migrations from almost any platform. If you were feeling kind of lonely and missed the human touch in your migration, say, from Lotus Notes to Exchange 2003, now comes the blog entitled "Tools for Moving to a Microsoft Collaboration Platform", written by a program manager at Microsoft.
Read all about it: http://blogs.technet.com/collabtools/