I'm going to try reinstalling my Air. Even given the de facto instability of anything from Apple in comparison to quality Windows equipment (provided the Windows maintainer is not incompetent of course), my Air is proving especially unstable in terms of Finder stability and wireless function. The only thing I really need to preserve in order to waste as little of my time as possible is the Entourage local cache of my Exchange mailbox and the settings for Entourage. Could someone give me pointers on which files / folders I should back up to allow me to slot the Entourage setting / offline cache straight back into a newly installed machine? Thanks.