How to enable Entourage syncing to iPhone and iPod touch
Microsoft Entourage 2004 is one of the applications on a Mac that you can sync contacts and calendars with iPhone and iPod touch.
iPhone, iPod touch, Microsoft Office 2004 for Mac
Entourage contact and calendar syncing requires the Microsoft Office 2004 for Mac 11.3.5 Update, accessible here. or you can use the Microsoft AutoUpdate application.
After you have installed the Microsoft Office 2004 for Mac 11.3.5 Update, the Sync Services option in Entourage will be available (In Entourage, choose Entourage > Preferences and click Sync Services under General Preferences).

Click to select the first two checkboxes so Entourage contacts and calendars will sync with Address Book and iCal. After that, iTunes can sync the data to iPhone and iPod touch.
After you click OK in Entourage Preferences, you'll see the following dialog:

Select the sync option that represents where you keep you information up-to-date. If all of your information is in Entourage and not Address Book, then select "Replace Sync Services items with Entourage items." If all of your information is in Address Book, then select the "Replace Entourage items with Sync Services items." If you have a mix of information in Entourage and Address Book, then you may want to select the "Merge Entourage items with Sync Services items."
Note: Entourage does not need to be open when syncing iPhone or iPod touch.
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