Oh yeah, the store folder will be in a different location when comparing '98 and XP

Outlook has it's store location in XP Pro here:

C:\Documents and Settings\insert username here\Local Settings\Application Data\Identities\{insert long ass string here}\Microsoft\Outlook Express\

In Win98, I think it will be like:

C:\Windows\Application Data\Microsoft\Outlook Express\

or if you have user profiles enabled:

C:\Windows\Profiles\insert user name here\Application Data\Microsoft\Outlook Express\