One recent migration was from an unsupported application built upon SQL Server 2000. Policy meant that I couldn't even try connecting to it directly. I was given a flat file export, but found I couldn't install an old enough version of SQL Server to import it. mdbtools to the rescue!
One of the hardest parts of any migration to Drupal is getting hold of the data in the first place. And once you do get hold of it, there’s every chance that it might not be a format that’s easy for you to work with.
Slides from and video of the Death of a Themer talk I gave at DrupalCamp London.
Slides from and video of the Death of a themer talk I gave at DrupalCamp Lond
James Panton presents an introduction to version control and the Git system at DrupalCamp North West 2012
"Git your act together and keep your code under control" session by James Panton at Drupa