Connect the device to the computer using the USB cable / cradle.
Open BlackBerry Desktop Manager. From the Macintosh desktop, navigate Finder > Applications > BlackBerryDesktop Manager.
Click Calendar, then click Sync Calendar.
Click the desired synchronization method.
Changes are synchronized to the device and desktop application
Do not Sync
Ensure the desired synchronization method is selected. For Calendars, click the desired calendars. To sync all calendars, ensure All Calendars is selected. If Selected Calendars is chosen, but a calendar isn't selected, all device data is deleted when synchronizing calendars or tasks. To sync all contacts and groups, ensure All Contacts and groups is selected.
Repeat steps 4 and 5 for Contacts, Notes and Tasks.
For Tasks, ensure the desired 'Tasks from' is selected then click the desired calendars. To sync tasks from all calendars, ensure All Calendars is selected.