Abusive contact Internet service provider Lycos has branded the action as "irresponsible" and fear children will move to other unmoderated chatrooms on the net.Some have suggested that MSN may have economic reasons for closing down their chatrooms.
He added that, although most messages in chatrooms were not inappropriate, a "small minority" had spoilt chat for people of all ages.
Microsoft's internet service MSN is to cut back drastically its chatroom services because of concerns about child safety, it said.
MSN is closing all its chatrooms in Europe, the Middle East, Latin America and most of Asia from 14 October, and changing the way others are operated globally.
"As a responsible leader we feel it necessary to make these changes because online chat services are increasingly being misused," it said.
Children's charities welcomed the move as "momentous" and said they saw it as a big step towards protecting young web users, but some have criticised the decision.