You figure in 2008 a simple import of a CSV file would not be difficult for Microsoft. Well, think again. I do use apple mail for some of my email addresses, but for work, I gave up fighting the battle and just use Entourage. I upgraded this week to MAC OS 2008 on my work laptop. To much of my surprise I could not export a CSV from ADDRESS BOOK. So I tried using the Address Book to CSV Exporter 1.3a Exporter from the Apple website. While this did a great job, Entourage could not read it. I can only imagine it was due to the header record not being complete. At the same time I found another utility Address Book Exporter and it transferred immediately. Difference of the two file exporters seems to be the latter has a more complete header record that Entourage finds more acceptable:
Address Book 2CSV seems to not include everything that Entourage would like:
First Name Last Name Title Suffix Nickname Company Job Title Dept Work Street Address Work City Work State Work Zip Work Country/Region Work URL Home Street Address Home City Home State Home Zip Home Country/Region Home URL Home Phone 1 Home Phone 2 Home Fax Work Phone 1 Work Phone 2 Work Fax Pager Mobile Phone Main Phone Assistant Phone Custom 1: Custom 2: Custom 3: Custom 4: Email Address 1 Email Address 2 Email Address 3 Email Address 4 Email Address 5 Email Address 6 Email Address 7 Email Address 8 Email Address 9 Email Address 10 Email Address 11 Email Address 12 Email Address 13 Custom 1 Custom 2 Custom 3 Custom 4 Custom 5 Custom 6 Custom 7 Custom 8 Custom date 1 Custom date 2 Spouse Birthday Anniversary Notes Age Astrology sign Bloodtype Furigana Company Name Furigana First Name Furigana Last Name Furigana Spouse Name Interests
Where as Address Book Exporter seems to satisfy enough familiar fields that Entourage does recognize it as a valid CSV format. As soon as I pointed to the EXPORTED CVS via Entourage's EXPORT I received the following Dialog:

Whatever the reason, this tool just worked. The above dialog does allows the addition of fields and modify current field mappings. Nonetheless, in less then 5 minutes from download, execution, exporting, conversion, and importing contacts in Entourage was < 5 minutes.
Address Book Exporter has been working since 2003 and seems the quckest to market and at the end of the day the less time to think about such trivial tools the better.
Um... I'm not sure if you're just trying to get your Apple Address Book
entries into Entourage. If you are, Entourage does that all by itself.
Just go to preferences>sync services and check the "synchronize contacts
with Address Book option.
Cheers
Kknut