>I would say that migrating is from one version of a particular piece of software to another more advanced version without being able to simply update your code ... whereas, Converting would be moving from one platform to another, say... VFP to .Net... Not sure if this is correct or not.... I really think the terms are used interchangibly...

Yes, this is exactly what I was trying to verify. The later situation is the one I am doing documentation on. Migrating is also what I think which seems to be about moving into something within the same context.