Outlook syncs over the air with the BB and the BB updates the calendar in Outlook if you make changes on the BB or add a date. The users who have access to the outlook calendar now will not loose this view because you add a link to the BB. As for syncing with an online calendar, if your company has restrictions and security for it's email you may not be able to do this. Most companys do not allow outsiders to view any internal resources.
Someone may have a 3rd party method but even that would need the ability to collect and send your calendar outside the company network. you may be stuck with manual update on the external calendar
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Z10 on BES