backup
go to tools-->options then 'maintainance' tab then "store folder"...copy the full path then go to start-->run. and paste the path in the run box. it will open the OE folder with a lot of .dbx file. now close OE and copy all of them.
restore :
open your new OE and create your account.After creation close OE then go the to very same path and paste your old dbx files there.
simple, if that don't work google "backing up outlook express"..there are a lot of programs who does that.