Outlook AutoComplete feature should be disabled out of the box.

[Frustrated User]

I sent a very improtant e-mail to the wong individual, because AutoComplete
(a feature where Outlook completes the e-mail address from a few characters
you type in) was enabled and picked the wrong e-mail address. It would be a
lot safer for us all if Outlook was installed with this feature disabled. If
folks liked the feature they could enable it after installation. I have
received e-mails which where not intended for me and I have sent e-mail which
where not intended for the receiver. If this feature was disabled as a
default this problem would occur a lot less frequently.

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[Russ Valentine [MVP-Outlook]]

Good point.
I wonder, though, is it really easier to pick the wrong recipient using the
Autocompletion list than the Outlook Address Book or autoresolution? Seem to
me like any method for selecting recipients is prone to user error, not just
autocompletion. Not sure how much users can be protected from making errors.