if you use word as the editor, it's controlled by word but if you use the
outlook editor, it's in outlook's tools options, spelling.
to undo the autocorrect, hit ctrl+z.

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Diane Poremsky [MVP - Outlook]
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> Is there a setting to avoid automatic capitalization of first words, words
> after periods, etc in Outlook contacts folder fields? I'd prefer not to
> turn
> off this feature for the rest of office, but it's annoying in things like
> email addresses!