It means no free, unmoderated chatrooms will exist anymore on any of MSN's global network of sites.
There has been growing concern among experts that the anonymity of net chat means young people are being targeted by adults pretending to be children.
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.
People have also been increasingly targeted by spammers posting hundreds of messages and inappropriate web addresses to chatrooms.
Many have been "mining" rooms for data, finding out users' e-mail addresses to build spam lists. MSN has acknowledged that some chatters will not be happy about the move.
"We have seen cases where under-16s have been approached by people pretending to be same age, but who are grown adults trying to solicit young people for abusive contact," Mr Whittingham explained.
He added that, although most messages in chatrooms were not inappropriate, a "small minority" had spoilt chat for people of all ages.
If you saved your chat history prior to the AIM shutdown on December 15, 2017, follow the steps below to view your saved versions of AIM.
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