( - BlackBerry is trying to reassure customers about its future through an open letter that will appear in many news publications Tuesday.

"You can continue to count on BlackBerry," the letter says. "How do we know? We have substantial cash on hand and a balance sheet that is debt free."

BlackBerry has been hammered by competition from Apple's iPhone and smartphones running Google's Android operating system. As more employees bring these devices to work, demand for BlackBerry smartphones has slumped, leaving the company nursing heavy losses.

In its open letter, BlackBerry acknowledged that Apple and Android devices are becoming commonplace in the workplace, but the company argued that it can help organizations manage these different mobile platforms "seamlessly and securely."

The company also said that it is making its popular BBM messaging service available on iPhone and Android phones, and noted that almost six million customers have signed up to be notified when the service is rolled out.

BlackBerry is now an acquisition target, either by the company's founders or investors such as Prem Watsa.

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