In an article describing Yahoo! and AOL exiting the corporate instant messaging market News.com notes current instant messaging market shares among corporate users. AOL Instant Messenger is used by 14.2 mln people at work, MSN Messenger enjoys the population of 12.6 mln, while Yahoo! is ranking third with 11 mln users. Most of the corporate IM usage had been grassroot, i.e., not mandated by IT department.