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Definition: Yahoo! Messenger

Yahoo!'s instant messaging (IM) service, which includes text messaging, voice calling and file sharing. Introduced in 1998 as Yahoo! Pager and renamed Yahoo! Messenger in 1999, it was discontinued in 2018. The IM client included Internet radio and the regular phone calling at rates as low as one cent per minute. Starting with Version 8.1, Yahoo! Messenger and Windows Live Messenger users could instant message each other. See instant messaging, voice chat and Yahoo!.