If you cannot open and view your emails, and you think it might be due to a tracker being blocked, that type of thing would worry me as I would wonder who was tracking my emails and why!
But I run Seamonkey and when at MSN.COM I click on Hotmail.
I am taken to the Hotmail page and can see all of the headers for the messages I have received. But I cannot open any of them!
If instead, I just use Seamonkey's mail I can open and read the messages.
I do not know what changed with Hotmail or Seamonkey that I can no longer open messages when using Seamonkey though.