Mr Whittingham said all net services offering chatrooms should continue to look at how they can safeguard everyone on the internet, ensuring young people and parents stick to common sense advice.
This means never giving out personal information online, and never arranging to see someone they have met online in the real world.
He added that, although most messages in chatrooms were not inappropriate, a "small minority" had spoilt chat for people of all ages.
MSN UK's Matt Whittingham told BBC News Online it was not a decision they had taken lightly.
"We have been concerned about chatrooms for a while and reached a stage where we were no longer prepared to put up with inappropriate communication," he said.
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