Rojanjosh wrote:

I imported an old .pst Backup by mistake

Never import from or export to a PST. There's never any need and you avoid
accidents like you describe. Plus, you lose data.

and now when I open my
outlook contacts all that there are old contact information. I need
to get back my information as it was before the import.

Can I reverse the import? How can I get back my conact information
before the import?

You can't undo an import. Unless you have a backup of your PST prior to the
import. That's why you make backups before making major changes.

If you display your folder in a table view, like By Category, you may find
it easier to delete the added data.

I have tried system restore but its telling me it cant restore.

System Restore doesn't monitor PSTs.
--
Brian Tillman