Is Outlook used with an Exchange server? If so, its very easy to configure
Entourage for Exchange and then your contacts will be available. I bounce
back and forth between Mac and Windows and with Exchange, I have the same
data available on both platforms.
There is also a MS PST import tool for Entourage. It is for the old Mac
version of Outlook but PST is the format used by current Windows Outlook.
Not sure if it will work.
http://www.microsoft.com/downloads/details.aspx?FamilyID=9b95cfe2-ea2b-4088-
af2c-2fd497e2a6f8&displaylang=en