BlackBerry CEO John Chen has been on the job for only a month, but his message is clear: BlackBerry isnt going anywhere. To bolster that sentiment further, Chen today issued a new open letter to his companys enterprise customers. After failing to make a sizable impact in the consumer smartphone market, Chen also reiterates that enterprise will be a leading focus for BlackBerry in the months and years to come. Chen confirms that handsets will be among BlackBerrys four target areas.