BlackBerry’s share of the mobile device market has been slipping since the introduction of iPhone in 2008. The company’s Enterprise Server (BES) management system has managed to keep BlackBerry embedded in some organizations. Meanwhile, little by little, we move into a world where employees can bring their own device to work. And more frequently than not, those devices aren’t made by BlackBerry.

But last week, RIM introduced an update to BlackBerry Mobile Fusion, its mobile device management system, which could help it keep a foothold in mobile business communication. Mobile Fusion will now allow business users to manage iOS and Android devices, as well as BlackBerry devices, all integrated nicely into BES. All Things D reports that Mobile Fusion is available to download for free, and companies pay either an annual fee of $99 or a monthly fee of $4 for each user managed through the system.

The move will allow BlackBerry to keep competing in the growing field of mobile device management systems, many of them cloud-based. And since BES is still the mobile device management system of choice for many large companies, they may have an upper hand over competing startups. Tony Bradley at PC World goes so far as to say that Mobile Fusion  “may be the shining knight that can rescue RIM.”

Of course, this update will also make it easier for companies that have been reluctant to let employees use iOS and Android devices for work do just that, meaning RIM’s share of the smartphone market is likely to see further decline.

But I don’t think RIM had a choice. If they want to stay relevant in the mobile device market, they have to face the reality that an awful lot of people are choosing to use devices they didn’t build. What do you think? Is BlackBerry Mobile Fusion a keen business move or the last gasp of a company in trouble?

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