Chief Operating Officer Marty Beard said in a statement posted on BalckBerry's website that the service will no longer operate in Pakistan from today.
Beard said that the company will exit the market because "remaining in Pakistan would have meant forfeiting our commitment to protect our users' privacy".
Telecommunication watchdog Pakistan Telecommunications Authority (PTA) in July notified the country's mobile phone operators that BlackBerry Enterprise Services (BES) would not be allowed to operate in the country from December "for security reasons".
Beard said that Pakistan wanted the ability to monitor all Blackberry Enterprise Services traffic in the country, including emails and BlackBerry Messenger messages.
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PTA had clarified that other Blackberry services such as messenger and Blackberry internet services (BIS) would continue.
Officials have not immediately reacted to BlackBerry's decision to pull out of the country.
The Canadian manufacturer once ruled the smartphone roost with its business-focused, keyboard-toting devices. But after being obliterated by Apple's iPhone and a slew of Android-powered devices, BlackBerry was relegated to tech's lower leagues.