If you log into YMSG protocol version 102 with either the cookie login (which is meant for 102) or the standard SSL YMSG login then you'll get this PM packet delivered as an offline each time you sign in. Not only will this mean that YMSGv102 will be gone, it may mean that we now have only one way to login to the YMSG chat server (the standard SSL login). There's no point in keeping the service 550 cookie login packet around if they're discontinuing 102 but we'll see... time will tell whether or not the "universal cookie login" aka the "magic cookie login", used for fast connects and resumes, will still be usable.
Another slick move by Yahoo! 