Check out Paul Berkowitz's "Export-Import Entourage" script package.
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http://www.scriptbuilders.net/?search=Export-Import+Entourage>
This is from the Read Me:
"3 Steps to Export from Entourage to Yahoo and Hotmail/MSN
Install Satimage scripting addition if if you've not done so previously.
1. Run the Calendar (Yahoo or Hotmail) or Contacts-Groups (Contacts
only, for Yahoo only) Export from X script. See Entourage-to-Entourage
section above.
2. Drop the text file on the appropriate EvX Calendar to Outlook or EvX
Contacts to Outlook script droplet in the Outlook Converters folder,
choosing Yahoo options. This converts the .txt file to a .csv file with all
the needed adaptations.
3. In the the Yahoo or Hotmail/MSN Calendar, or Yahoo Address Book,
click Options/ Export-Import, or the Import tab or links, until you reach
the full Import screens. Choose the Import Microsoft Outlook (CSV) option
(as if you had exported from Outlook). All your data will be imported
immediately."
"Hotmail/MSN cannot export directly, but if you have access to a PC or have
Virtual PC on your computer, you can synchronize the Hotmail/MSN Address
Book with Outlook Express Windows and export the Address Book from there."
