Why Do We Still Have Vendor Lock-In?
http://asserttrue.blogspot.com/2009/03/why-do-we-still-have-vendor-lock-in.html

assertTrue
2009

Abstract:

There's a common myth that one of the main reasons enterprise customers get locked in to a particular vendor's technology is the huge investment (of time and money) that goes into specifying, procuring, rolling out, and maintaining a large system. I was talking to a financial analyst the other day about this very phenomenon. The name of a well-known CMS vendor came up. My financial-analyst friend -- somewhat new to the software biz -- asked whether the huge cost of rolling out, training for, and maintaining a large system didn't pose an enormous disincentive for customers considering moving to another system. I said no, that's a myth.