At the time of this writing, BlackBerry devices are not and never have been affected by any form of malware. This includes viruses, trojans and other sorts of applications that negatively affect a system's performance.
The fact of the matter is that malware is written to affect the largest user base as possible, and that is Microsoft Windows-based personal computers. BlackBerry OS is Sun Java-based, and is therefore not affected by malware written for Microsoft Windows. Further, the BlackBerry OS is arguably the most secure mobile computing platforms in the world. This, coupled with the fact the OS is proprietary and runs only on Research in Motion brand BlackBerry devices (BlackBerry Connect is an application for other platforms, and is not an OS), makes BlackBerry devices a very unatrractive target. Obviously this could change in the future, but it is highly unlikely.
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