Why won't OUtlook 2003 open when I'm 'off' the network. I used to be able to open my locally stored PST when I had outlook 2002 but now I get 'unable to open outlook. the set of folders could not be opened'. ? I don't have offline folder ost setup - I never used to have to have this feature. Is this not possible with 2003. Do you have to have offline OST file setup?