An ASP.NET application (actually with Silverlight but it doesn't matter) is hosted in Outlook as folder home page. In this application there's a link to open popup window, which opens a separate IE window, not in Outlook.
The problem is that in this case it seems that ASP.NET session is lost. A call to ASP.NET service has nothing in Session and Session._id is different. I suspect that Outlook has different cookies than IE.
How do I preserve session when opening IE popup from Outlook? Maybe pass session id via URL somehow, or configure this in web.config?
Note that I don't want cookieless sessions.