If you like to send an Instant Message between iPhone and Blackberry you might want to use your BBM (BlackBerry Messenger) to Ping Messenger (iPhone IM). Unfortunately, this thing can’t be done. Alternatively you can use popular Messenger Service that works under both of them. For example Yahoo Messenger for iPhone to Yahoo Messenger for BlackBerry.

WhatsApp Messenger is other alternative solution for your problem. WhatsApp is an application that designed to works with both of iPhone and BlackBerry. It also called as SmartPhone Messaging.

Features in WhatsApp Messenger

Exchange messages with your friend with no charging fee for SMS, EDGE/Wifi/3G supported connection, contact list, file sharing, video sharing, image sharing transfer, audio transfer and many more (unlimited)

Download WhatsApp

For Blackberry users, you can download the application of WatsApp at http://www.whatsapp.com/appworld/, and for iPhone users you can download at iTune App Store at http://itunes.apple.com/app/whatsapp-messenger/id310633997?mt=8

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You got a brand new Operating System for your Mac: Snow Leopard OSX or Others Old Mac OSX, and want to use Yahoo Messenger Official Client that works properly in there with more enhanced stability, you can try to use Yahoo Messenger for Mac 3.0 Beta.

Features in this version including Yahoo Insider that would make you faster to received local news, weather, mail notification and more.

Download Yahoo Messenger 3.0 Beta for Mac Installation File

You can download the file installer of YM 3.0 Beta for Mac (Snow Leopard Supported) here: Download YM for Mac

After the file downloaded completely, just double click the installation file to install the Yahoo Messenger for Mac.

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To Reply any Incoming Message in your Google Talk Messenger Service, you may need to install and use GTalk Auto Reply. This GTalk Application would help you to answer or response any incoming message automatically with the text message that you have to add before.

Download Google Talk Auto Reply Software | Source Code

License: Open Source / Free
Website: gtalkautoreply.codeplex.com

Installation

• Download the gtalk auto response software and run setup.exe
• Use your gtalk account with its password to login and set the auto reply message that you want.
• Done

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For Motorala this Yahoo Messenger Clients works at version Motorola E398, Motorola L6, Motorola ROKR E1, Motorola ROKR E2

Features of Y!amee YM mobile client are: Chat IM, Buddy List, Emoticons, Sound Message Alert, Send Buzz and many more.

Yamee can be used for GPRS Connection or UMTS connection (HSDPA also works)

Download Yamee: Yamee at Get Jar | Yamee 1.3 at softpedia | Yamee version 1.1 at java-phones
License: Freeware
Website: Unknown

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Download: YMess at debii.com (JAR File)
License: Free
Website: Unknown

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