Hello For the past 2 weeks I've been trying to login to Hotmail without success, I found out that some cookies are not being passed. I've attached the fiddler's screen shot which shows the cookies in the server response. I found out that the first cookie "MSPRequ=lt=1287096700&co=1&id=64855; path=/;version=1" does get added to the cookie container but the second one "MSPOK=$uuid-33b7d7e6-4b2b-48da-84dc-51eba83871ba; domain=login.live.com;path=/;version=1" never gets added, so I decided to parse it out from the response headers and add it manually. Code: cookieContainer.Add(new Uri(incomingUrl), new Cookie("MSPOK", "$uuid-94923791-c0d6-43f2-ac78-dba34acd86cb; domain=login.live.com;path=/;version=1")); But when adding the cookie I get the following exception "System.Net.CookieException: The 'Value'='$uuid-94923791-c0d6-43f2-ac78-dba34acd86cb; domain=login.live.com;path=/;version=1' part of the cookie is invalid." Any idea what I can do? Best Regards!