According to the small print on their website
https://ca.blackberry.com/business/software/bes-10.html#device-management
*60-day Free Trial Offer: Limited time offer; subject to change. Limit 1 per customer. Trial starts upon activation and is limited to 50 Corporate EMM licenses and 50 Secure Work Space licenses. Following trial, customer must purchase service to continue use of product. Not available in all countries. A trial system can be upgraded to a production system at any time by adding a production key either from the BES10 v10.1 trade up program or purchased from an authorized reseller. When a system is upgraded to production, the trial licenses will no longer be available. Secure Work Space option requires BES10 v10.1
**Free until December 31, 2013
1 Note: Regulated-level EMM is available with BlackBerry Enterprise Service 10 for BlackBerry 10 smartphones
2 Note: Regulated-level EMM is available with BlackBerry Enterprise Service 10 for BlackBerry 10 smartphones
3 Note Enterprise Instant Messaging supports the following systems: Microsoft OCS 2007 R2; Microsoft Lync 2010, Microsoft Lync 2013 and IBM Lotus Sametime.