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To set up Google Sync on your Windows Mobile device, please follow the steps below.
Important Note: Make sure that you have backed up any Contacts and Calendars from your phone to your computer before proceeding.

Getting Started

1. Open the Active Sync application on your device’s home screen.
2. Click the link Set up your device to sync with it.
3. Enter m.google.com as the server address.
4. Ensure that the SSL option is checked.

Sign In to Google Account

5. Click Next.
6. Enter your full Google Account email address as the User name.
7. Enter your Google Account password as the Password.
8. Leave the Domain field empty. If your device requires you to enter a domain name, enter google.
9. Click Next.
10. CheckContacts, Calendar, or Email, depending on which you’d like to sync.
11. Click Finish.

12. Press the Sync softkey on the left to synchronize.

You’ve now set up Google Sync for your Windows Mobile device.

Source: http://www.google.com/support/mobile/bin/answer.py?answer=138636&topic=14299