Hi,
NULL pointer dereference should be fixed. Regarding old MSN-Account I'm a bit clueless, because my Account is also linked with Skype and when creating a new MSN account, it autmatically gets added a live:* Skype companion user on first login in Skype, so not sure on how to test "classic" MSN accounts...
As I believe there is no other Messenger Application besides Skype officially supported by M$ now, maybe unlinked accounts don't even work anymore (because as I said, Skype adds a Skype-Companion user to it, when you login in Skpye client with it the first time).