Kacie, (interesting name)

Creat an AutoText entry.

Type out the salutation (or closing, or whatever) as it should appear.
Select it and press ALT+F3. Name it something like mysaluation and
click OK.

Now check that ToolsAutoCorrect OptionsAutoText "Show autocomplete
tips for AutoText and Dates" is checked.

Start typing mysa... and hit enter when the autocomplete tip appears.