Since these are POP accounts you might not have to migrate any of your data.
First, check to confirm a specific setting is enabled for all three of these accounts.
- Open Entourage
- Select Entourage > Account Settings
- Select one of the accounts
- Go to options and confirm "Leave a copy of each message on the server" is enabled.
Second, if the above is enabled just configure the POP accounts in Outlook. It will pull these messages from the POP server and all is well.
If the above is not checked, and all of your E-mails reside on the Mac you have to be aware that Entourage does not export information into an extension Outlook will recognize.
I do believe you can export our of Entourage then you can import to Outlook express then export to a .pst so Outlook can import it.
Keep me posted.