Ark - in W2000 they are stored in 'Documents and Settings/''USER??"/Application Data/Identities', and you can change the store location for OE through 'Tools/Options/Maintenance'.
Suggest you copy both your 'currrent' and any 'old' store folder somewhere else (not 'E'
) before you try to 'import' emails, which you do via 'File/Import/Messages' then select OE4/6, NEXT, 'Import from Store Directory' - browse to chosen - and awa you go. Good luck!