We are running Exchange 2007. We have Outlook 2007 users, and OWA 2007 users who do not use Outlook at all. We want to add events/holidays to all personal calendars, not just those of Outlook users. Is there a way to add holidays (or any events) to all personal calendars on Exchange, so that they show up in either Outlook or OWA, and so that it doesn't affect existing appointments, etc? We also have SharePoint 2007 - is that a possible avenue to pushing events/holidays to all calendars on Exchange?