Old Outlook email to new PC

See the following Knowledge base article that may provide info
This article was previously published under Q270670
For information about the differences between Microsoft Outlook Express and Microsoft Outlook e-mail clients, click the following article number to view the article in the Microsoft Knowledge Base:
257824 OL2000: Differences Between Outlook and Outlook Express

SUMMARY
This article describes how to back up and restore your messages, Address Book, mail accounts, and news accounts in Outlook Express 5 and later. If multiple Identities are in use for Outlook Express, these steps should be repeated for each Identity and the backup data segregated accordingly. This will facilitate restoration of each Identity.
MORE INFORMATION
To backup Outlook Express data:
Copy mail files to a backup folder
Export the Address Book to a file
Export the mail account to a file
Export the news account to a file
To restore or import Outlook Express data:
Import messages from the backup folder
Import the Address Book file
Import the mail account file
Import the news account file

Which mail client r u using, outlook express,
MS Outlook or Eudora. Please let me know.
For sure i can help ?