Outlook does it because you told it to. You have configured Word as your
editor and have told it to "Mark My Replies" with [Bob].
Examine your settings.

--
Russ Valentine
[MVP-Outlook]
"Bob L" wrote in message
...
Windows XP, Outlook 2000. When I reply to a message and compose some
text, I have no problems. But, when I attempt to edit any of the text
contained in the original message, and press the space bar or any of the
alphameric keys, my name is immediately inserted like this: [Bob].

For example, if I received the above paragraph in an email and then
replied to it, and tried to insert a space between "Windows XP" and the
",", what would appear is: Windows XP [Bob] . Why does Outlook do this
and how do I stop it?