Upgrade to flash professional 8

has anyone upgraded to flash professional 8 from flash mx 2004?

i’m thinking about downloading the upgrade from macromedia for $299.

if i do the upgrade, does it turn MX04 into 8? or will my computer recognize each as a separate application? ie, will i still have MX04 and will i have the new 8, or will i just have 8 after the upgrade?

i’m wondering because some clients want work done in 8, and others want work done in MX04. and i don’t want there to be any version problems with the FLAs when dealing with my MX04 clients if all i’m going to have after the upgrade is 8.