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as some answers noted, the keyboard and email were definitely the draw, but I'll add something from my own experience dealing with business stuff over the years - there was also this perception that BlackBerry was secure and professional, almost like a status symbol.
People trusted them in a way they didn't quite trust other phones yet, and once a company standardized on BlackBerry for their whole team, switching away felt risky. By the time touch screens got good enough that people didn't miss that keyboard, Android and iPhone had already caught up on security and reliability, so the spell was basically broken.
BlackBerrys dominated the business world mainly because they had a built-in physical keyboard and exceptional email functionality that was seamless and reliable, which was huge before smartphones became universal.
The devices also featured strong encryption and security features that made corporate IT departments trust them with sensitive data, plus they had excellent battery life compared to early touchscreen phones.
When the iPhone first came out, it seemed like a toy to executives, but the BlackBerry was specifically designed for professionals who needed to stay connected and productive on the go - it was basically the mobile email device before mobile email became standard on everything.
I'd push back a bit on framing this as pure technical superiority - plenty of phones had keyboards and email back then, but BlackBerry won because it became a *status symbol* in corporate culture, almost like wearing the right suit.
Once it was the phone executives carried, everyone else wanted one to fit in, which created a self-reinforcing cycle.
The one thing people tend to miss is how much the carrier partnerships mattered: BlackBerry had deals that gave it preferential treatment on corporate plans and IT integration, so even if you preferred something else, your company's system was already set up for BlackBerry devices. That infrastructure advantage was harder to overcome than any feature comparison.
The thing people often overlook is the security model. BlackBerry devices ran on their own operating system and infrastructure, which meant RIM controlled the entire chain - hardware, software, and the servers that routed messages. For companies handling confidential information, that was genuinely reassuring. You weren't relying on some third party's cloud service or hoping Android's open ecosystem didn't have vulnerabilities. The encryption was built in from the ground up, and IT departments could actually manage and audit the devices properly. That kind of control mattered enormously in industries where data breaches could mean lawsuits or regulatory fines.
Beyond the keyboard and email reliability that everyone mentions, there was also this self-reinforcing network effect specific to the business crowd. Once major corporations standardized on BlackBerry - and a lot of Fortune 500 companies did - it became the tool you needed to be compatible with your colleagues and clients. If your CEO was using one, your executives probably were too. If your law firm or investment bank had standardized on it, switching meant retraining people and dealing with integration headaches. That switching cost was real and substantial, probably more than most users consciously realized at the time.
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