Moving from 2003 to 2008 R2

Hi All,
I have ASP.net application developed in .net framework 2.0, running very well on windows server 2003.  Now I am planning to move this application on windows 2008 R2 server (framework 2.0).
The application uses CustomIdentity class that implements IIdentity interface,  inherits MarshalByRefObject class and CustomPrincipal class implements IPrincipal, inherits MarshalByRefObject 
public class CustomIdentity : MarshalByRefObject, IIdentity{//code}public class CustomPrincipal : MarshalByRefObject, IPrincipal{//code} After successful login, user's information is saved in the instance of CustomIdentity class
CustomIdentity _objUserIdentity = new CustomIdentity(_strUserId, _isUserAuthenticated, true, _strEmail, _strRoles.ToString(), _strEntitlements.ToString(), _strCode, ...