If you have a list in the body of a message you're composing, you can have Outlook sort that list for you, either from A to Z or Z to A.
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Select the text in a one-level bulleted or numbered list.
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Go to Format Text > Sort.
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Set Sort by to Paragraphs and Text in the Sort Text box.
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Select either Ascending (A to Z) or Descending (Z to A).
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Select OK.
For info on sort options, see Sort dialog box.