-Do the current trial versions of either app actually expire? Or, as before, just leave a Nag screen? no expiry just a nag screen. -Any security issues or differences? better security and improved compression algorythms than a 10 year old DOS version ;) -Any real differences or advantages to one or the other? (the version of WinZip I had last tried did not allow for relative file paths, just full paths or no paths, which is why I've kept using PKZip) Anything else like that? drag and drop ability, relative file paths, etc... I would upgrade.... they've improved a lot in the last few years...