Operating System for Blackberry mobile phone....

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Hi there. I thought already about purchase the Blackberry, but I don't know how it's like... with the access to the software. Whether this company assures choice of programs? I am using windows and linux operating systems and I don't know how blackberry will behave in this system? Whether on blackberry it is possible install different operating system like symbian, linux o windows mobile? Thanks in advance, malawika.