Switch to Mail.
CTRL+1
Switch to Calendar.
CTRL+2
Create a message.
CTRL+SHIFT+M
Reply to a message.
CTRL+R
Redo or repeat an action.
CTRL+Y
Remove paragraph or character formatting.
CTRL+SPACEBAR
View the folder one level up in Windows Explorer
Alt+Up Arrow
Switches between worksheet tabs, from left-to-right.
CTRL+PgUp
Closes the selected workbook window.
CTRL+F4
Switches to the next workbook window when more than one workbook window is open.
CTRL+F6