Hello, this won't be easy. You need to deploy a Geneva Server in your company, and configure the Geneva Server to use your Active Directory as the identity provider. Then configure your ACS scope to accept claims issued by your Geneva Server. Now on the client side, you will be able to login with your Active Directory account.
I suggest you to download the Identity Training Kit from
http://www.microsoft.com/downloads/details.aspx?displaylang=en&FamilyID=c3e315fa-94e2-4028-99cb-904369f177c0. Pay special attention to "Access Control Service" => "Exercise 3: Configuring a Web Service to Accept Tokens from .NET Access Control Service". It tells you how to configure ACS to accept tokens from a custom STS. In your scenario, you need to change the custom STS to your Geneva Server.
Lante, shanaolanxing This posting is provided "AS IS" with no warranties, and confers no rights.