We are currently running Zen32 on Netware 6.5 SP7 edir

I want to upgrade to Zen7 (only licensed for 7) and have some questions

- I've heared no application will work after the upgrade, what is up with that?
- Is it possible to extend the schema but not to upgrade at this moment. So, if you extend the schema is de upgrade a must?
- I read a lot about interoperatibility with Zen4 but nothing on Zen32

May be some other considerations?