thunderbird

Hi, I have a couple of Gmails accs into Thunderbird going perfectly well. Today I tried to add one of my Hotmail acc and it says - username/password error. I double checked the email and pass and copy pasted the exact same multiple times and same thing. Then I wrote the password into Thunderbird...

Hey guys, I need help. I need to know how to use Thunderbird to send mass emails? I am currently using gmail and would like to keep everything free.