[Paul M]

Personally I cannot see me ever running anything beyond VB4. The basic design of VB5 means it will just wont perform that well on large sites, and a new version (VB6+) designed in a different way seems compltely unlikely now, or in the forseeable future. Atm, vB3.8 is running our site quite happily, and will continue to do so for a long while. We could move too VB4.2 if necessary, but in both cases the only likely issues are php compatibility, so I should be able to keep them running for years yet.

If it ever came to a point where I had to move, then I'd look at what alternatives were available at the time.