You have Ctrl-F as discussed which is completely different to the rest of windows.
You have alt-S for send as well which is used in some language for special characters.
And the most annoying is shift+enter. When you want a single line break in an HTMl email it sends it instead. This has a warning now.
No end of grief those have given me.
I'm on Outlook 2007, so I don't know if the preference has moved in 2010 or 2013, but:
Tools > Options > E-mail Options > Advanced E-Mail Options > uncheck "Press CTRL+ENTER to send messages"
Ctrl-enter is send in at least the US version of Outlook, it has been for years (e.g. at least the last decade I think.)
Shift-enter is single new line, across all versions of Office apps.
Alt together some character is used as hotkey in ALL applications. Hold it down and you will see a small underline under (usually) the first character of most buttons, press this character on the keyboard and the button will be pressed. I think it would collide with S quite frequently. It is AltGr-S you are supposed to use for localized S-characters.