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Multiple views: Month, 2 weeks, week, agenda, list view
Scheduling: Drag and drop events to set their start/finish date, can also resize and move events to update existing dates
Filters: Filter by work item type, iteration, or state
Calendar options: View iterations, team days off, working days, etc.
Summaries: Click on events to view work item summary, or click on day/multiple days to view summary (aggregate of effort, remaining work, etc.) for selected dates