More than that the advent of 3G and LTE made the blackberry phones irrelevant... You see Their push email was phenomenal for receiving heavy emails when gprs and edge speeds were the norm... The emails would be downloaded on their servers, compressed and then pushed to your device... That's where BB had the benefit... Now with 3G and LTE it doesn't matter how heavy the files in the email are... I can definitely say for 9% of the common folk it doesn't matter if you get a work email on the instant or 15-30 minutes late (if you set your iphone on fetch email)... And if you are really expecting an urgent email you tend to stare at the mail app and refresh like mad anyways...
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But, companies who stick to their old ways and past successes and arrogance and refuse to see the light of the changing trends even after being kicked in the groin repeatedly should be avoided at all costs too...
Yup...I get my emails in an instant it reaches my inbox, so I see no benefits of a BB server to push out my emails. Let's face it, BB will be sold sooner or later. Their patent portfolio is worth it, then just sell the device side seperately.