S60 Platform

A client for Windows Live Messenger was developed by Microsoft for the Symbian S60 Platform commonly used in mobile phones such as Nokia smart phones and released on August 23, 2007, to selected markets. This version of Windows Live Messenger includes many of the features of the Windows Live Messenger client, including grouped contacts, voice clips, image and file sending; as well as features unique to S60 such as tabbed chat windows and integration with contact list and other features of the S60 platform. Microsoft installed a prompt at the start of Windows Live Messenger for S60 at Logon[9] When the trial expires the cost to users of Messenger for S60 is £1.50/$2.94 for 30 calendar days of use

Resource: Wikipedia