Standard connectivity is available via Blackberry Internet Services (BIS). Instructions on configuring the device are available here: Configuring a BlackBerry with BIS
Nexus also offers a BlackBerry Enterprise Server (BES) for those requiring greater functionailty (calendar, contact and task syncronization in addition to email services). The BES service has a set of Terms and Conditions and is dependent upon an enterprise or BES-enabled contract with the mobile provider. Please contact us via email to firstname.lastname@example.org for further details.
Once the BES service has been configured to accept your device, please follow the instructions Configuring a BlackBerry with BES.