Compacting benefits you in (at least) two ways:
1- Reduces the possibility of lost messages due to message store corruption.
2- Consolidates and frees up disk space.

I'm wondering why you don't want this to happen?
---
Leonard Grey
Errare humanum est

Merle wrote:
> Is it possible to uninstall outlook express and if so How? I get tired
> of the nag screen to compact my messages