Importing Outlook contacts into a SharePoint application page

Answer 1

Alex One Simplest option I can think of is that instead of having the Text box for the email Address in Send Document page you have a People picker control and and use that to fetch the email id of the selected user.

Answer 2

Do you really need the Outlook address book control in particular, or just the values in the GAL that Exchange knows about? If it's the latter I suspect you could gin up a reasonable UI to call the ResolveNames Operation that's part of the Exchange web services. If SOAP isn't your thing and OWA is available to you, you could try an approach that uses more REST-style calls to OWA.