Perils of Lock-In to a Closed Source solution

InfoWorld have an article demonstrating one of the traps of closed source software: forced upgrade and a requirement to change server software.

"The upshot is the reader's clients first had to upgrade their accounting package and then had to spend extra money to continue using it. "In both cases the software developers are forcing my clients to use server software we had decided would be unnecessary and would add to their costs,""

The article is here.