Shortcuts for Calendar
Shortcuts for open
Ctrl+N - Create a new appointment
Ctrl+Shift+A - Create a new appointment from anywhere in Outlook
Ctrl+Shift+Q - Create a new meeting request
Ctrl+. (period) - Read a next appointment (with an appointment open)
Ctrl+, (comma) - Read a previous message (with a message open)
Shortcuts for replay, forward
Ctrl+F - Forward an appointment or meeting
Ctrl+R - Replay to a meeting request with a message
Ctrl+Shift+R - Replay All to a meeting request with a message
Navigation shortcut keys
Alt+1, Alt+2, and so on, through to Alt+0 (for 10) - Show from 1 to 10 days in the calendar
Ctrl+G - Go to date
Alt+- (minus sign) or Ctrl+Alt+3 - Switch to Full week view
Ctrl+Alt+2 - Switch to Work week view
Alt+Home - Start of week
Alt+End - End of week
Alt+= (equals sign) or Ctrl+Alt+4 - Switch to Month view
Ctrl+right arrow/Ctrl+left arrow - Next/previous day
Alt+down arrow/Alt+up arrow - Next/previous week
Alt+Page Down/Alt+Page Up - Next/previous month
See also this tip in French: Raccourcis pour le calendrier.