Apple has managed to position itself very well as an enterprise vendor. The company has learned from its past mistakes to avoid proprietary solutions or add too much complexity for IT departments. Apple has also managed to leverage its supply chain and economies of scale so well that it's difficult for other mobile device manufacturers to compete without notably sacrificing quality. Ultimately, these have in the past been the two biggest barriers to entry for Apple technology in the workplace.
Apple also managed to stake out mobile territory far earlier than many of its competitors by being the first company to successfully take mobile solutions like tablets beyond just a niche market. That head start is a massive advantage and it allows Apple to continue to innovate for business needs and environments while other companies are playing catch-up.
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