WhatsApp, which has over a billion users globally, had earlier this week said it will end support for BlackBerry phones and those powered by Nokia's Symbian operating system later this year.
"BlackBerry is committed to our BlackBerry 10 operating system, and we work closely with developers to create and deploy solutions to bring apps to our consumer and enterprise fans. We continue to invest in the BlackBerry 10 platform and will introduce several key security updates this year," BlackBerry said in a statement.
"Users of BlackBerry PRIV, which runs on Android, will not be impacted...While the app landscape continues to evolve, our commitment to BlackBerry10 and our developers is unwavering," it said.
BlackBerry, in its blog, said it is building more features into BBM, especially on the security front.
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"We're evolving group and multi-person chats. We're making BBM Protected an even better messaging solution for security-conscious organisations. We're giving you ever more privacy and security by allowing you to control previews. We're also working to make BBM more convenient and more fun," it said.
Once exclusive to BlackBerry devices, the company made BlackBerry Messenger (BBM) available on rival platforms of Android, iOS and Microsoft in 2013.
As of March 2014, it had about 85 million monthly users and around 113 million global registered users. The move was aimed at offering the struggling smartphone maker get newer avenues for monetisation.
WhatsApp said it had made the "tough decision" to end support for BlackBerry (including BlackBerry 10), Nokia S40, Nokia Symbian S60, Android 2.1, Android 2.2 and Windows Phone 7.1.
However, mobile operating systems offered by Google, Apple and Microsoft account for 99.5 per cent of sales today.
WhatsApp, which competes with the likes of Hike, Viber and LINE as well, is very popular in emerging nations like Brazil, India and Russia.