Mats Samson wrote:
Thanks Brian,
but I don't understand the meaning of the option.
"...save replies with original message" is NOT ticked but when I reply
to a message I always have the original message included.
Otherwise it would quite laborious to follow a thread.

What that option does is to place outgoing replies to messages in a
particular folder back in that folder instead of putting them in Sent Items.
--
Brian Tillman [MVP-Outlook]