That's because Outlook must be expressly configured to use a different PST.
Overwriting a PST just corrupts your profile. Instructions depend on your
mail support mode of Outlook 98, which you did not post.
Corporate Mode: (With Outlook closed)
- Control Panel > Mail applet
- Remove the current Personal Folder service
- Readd the service, directing it to the new PST file location
- Restart Outlook
Internet Mail Only mode:
- File menu > Open > Personal Folders file > migrate to the new PST file
location to open it
- Right-click on the root of the new set of folders in the folder pane (View
- Choose Properties
- Check the "Deliver POP mail" box
- Quit & restart Outlook
- Now you can Close the PST file that you were previously using (R-click on
that pst folder while in Folder View and select "Close <foldername>
Folders"). If you have any information in your former PST that you'd like to
transfer to your new default PST, you can drag and drop from one to the
other before you close the old one.