BlackBerry Messenger was downloaded more than 10 million times by iOS and Android users in the first 24 hours in which it was made available for the platforms earlier this week.

The messaging and social networking app has become the top ranked free app in Apple’s App Store in 75 countries, including the US, Canada and UK, Indonesia and much of the Middle East.

And it seems BBM has been well received by those that have downloaded it—it earned 60,000 five-star ratings out of 87,000 reviews in Google Play.

The figure is impressive but less surprising given that around six million people signed up for email notifications updating them about availability of BBM for non-BlackBerry platforms. Such has been the demand for the BBM app for Android and iOS that users are now having to wait for the service to be activated after they downloaded the app.

“The mobile messaging market is full of opportunity for BBM. We intend to be the leading private social network for everyone who needs the immediate communication and collaboration of instant messaging combined with the privacy, control and reliability delivered through BBM,” said Andrew Bocking, executive VP for BBM at BlackBerry.

The launch of the app was botched in September after one million Android users downloaded an unreleased version of BBM from file-sharing sites, creating issues for the official client. BlackBerry reportedly put the app back into beta testing.

With BlackBerry in the midst of a strategic review which could potentially see it broken up or acquired, there have previously been reports that a spin-out of the BBM unit is a possibility.