MySQL commercial licence

[Adam Lipscombe]

Folks,


We have a commercial product that uses mysql 4.0.24. We bought  a commercial
licence for this version.
We want to upgrade to 5.0.21. 

I spoke with the MySQL saleswoman this morning and she says they don't do
upgrades and want another entire licence fee for v5.x.


Does anyone else have experience of this? Upgrading commercial licences?
What's the story?


Thanks - Adam