Options for access
<<This option requires enabling Google Sync in the Mobile section of your domain's Google Apps Control Panel. REMOVE this section if you're not enabling Google Sync.>> Use your Windows Phone's native apps	Set up your Windows Mobile phone with Google Sync to access your Google Apps mail, contacts and calendars from your phone's native applications. Learn more about Google Sync
Use your phone's mobile browser	Access other apps such as Docs and Tasks from your phone's browser app. Just point the browser to m.google.com, touch the app you want to use, and sign in to your Google Apps account.

Mobile apps overview

Here's a look at just a few of the apps you can use on your Windows Phone! <<Modify this list as necessary based on which apps you're deploying.>>

Gmail Send and receive mail. Google Calendar View and add calendar events. Google Talk Send instant messages. Google Docs View docs  Contacts Access and update contacts. Tasks View and add tasks to your Tasks list.

What other Google Apps can you use on Windows Mobile? Visit Google's Windows Mobile Help Center.