The meaning of the Acronym MSN is...

MSN is

• Mental Stimulation Nil

More Meanings For MSN:

• Microsoft Network document
• Medicare Summary Notice
• Most Significant Nibble
• Multi Subscriber Numbering
• Mega Software Net
• Multiple Subscriber Number
• Multiple Subscriber Numbering
• Mobile Subscriber Number
• My Screen Name
• Media Serial Number
• Minority Scientist Network
• Major Shaft Network
• More Suckers Needed
• Me Speak Nogoodengrish
• My Sexy Nose

MSN is also in:

• Chat
• File Extensions
• Funnies
• General
• Hardware
• Networking
• Telecom
• Universities