Users of Instant Messenger can keep receiving messages, even when they are not logged on to their personal computer, as Microsoft and eight European mobile operators expanded the service to mobile phones.
A message sent from a PC to a user who is "off-line" will automatically be forwarded to his mobile phone in the form of a short SMS text message. Replies from a mobile phone will land back in the Instant Messenger dialog box on the computer. Mobile phone users will be charged per message received or sent.
Operators in Belgium, The Netherlands, Switzerland, Denmark, Austria, Turkey and Norway, with a combined total of 31 million customers, were to launch the service on Monday, in conjunction with Microsoft's internet services unit MSN.
Microsoft is the only company bringing an Instant Messenger to European mobile phones, but America Online and VoiceStream, owned by Germany's Deutsche Telekom, have brought AOL's Instant Messenger to phones in the United States since November.
MSN Instant Messenger has 13 million users in Europe and 46 million worldwide. It competes head to head with AOL Instant Messenger whose users generate some 1.2 billion messages a day.
Instant Messenger is the second MSN service after Hotmail which is being offered by wireless operators KPN Mobile Netherlands, Belgium's Proximus, Denmark's TDC Mobile, Switzerland's Swisscom and TDC-owned Sunrise, Austria's ONE/Connect, Norway's Telenor and Turkey Turkcell.