Mail.ru Agent
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Mail. Ru Agent (M-Agent) is a free instant messaging program created by Mail.Ru - one of the largest Russian web portals. Besides basic IM functionality (presence, contact list, sending text messages, file transfers, message history, etc) M-Agent also provides online gaming, peer-to-peer voice calls, low-rate VoIP calls, free SMS, automatic mail checking and other useful features.
Mail. Ru Agent runs under Microsoft Windows and communicates with server using proprietary (but documented) protocol called MPP that works over TCP. Mail. Ru Agent uses portal e-mail address as unique user ID.
Mail.Ru has opened the Agent's messaging protocol and allowed anyone to create third-party clients. Several implementation of them exist, mainly designed for mobile phones. Also, some Jabber servers support gating into it.
In addition to this, in February, 2007 Mail.Ru has released its official client for mobile phones. The first version, 1.0, contains many bugs rendering it unusable on some phones. Such bugs include backlight disabling and unability to login when there's no incoming messages awaiting on the server.
In 1 March, 2007, the improved version 1.1 of the official mobile client was published. Many, but not all, bugs of the previous version are fixed in it, making it usable on phones which are unable to run the previous version correctly.
All mobile Mail.Ru Agent clients lack many features of the desktop version, such as gaming, VoIP communication and cartoon sending, but include the SMS sending feature.