Does native exchange offer this functionality? If not can we build an interface from SharePoint or something else to Exchange to meet this requirement? How about other products out there?
Requirements:
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A user interface that enables you (the schedulers) to schedule events in Outlook that automatically schedules a preset number related tasks (more calendar events) prior to the principal event. An executive group will get an Outlook event invite to the principal event and staff will get invites to all the related tasks. Dates for related tasks will be generated automatically and factor in weekends and holidays.
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A user interface that enables you (the schedulers) to see and filter by event in a way that lists all related tasks, participants and accept/decline status.
The interface for all participants must be Exchange and all participatns must receive exchange invitaions and meeting alert notifications as they do today for other Exchange calendar events.
Try to use SharePoint OWA (outlook web access) web parts, I think they have all your requirements, if not you need to develop you requirement using Exchange Web Services