Using and Customizing Auto-Correct in Outlook 2010

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To customize your Auto-correct settings go to File > Options
Navigate to the Mail > Spelling and Auto-correct button
Select Auto-correct Options.
Note: There are several other Proofing options on this screen. Please take note and adjust should you desire.
You will be presented with the Auto-correct settings.
For this example we will opt to replace msg with message. This will enable to use this abbreviation when composing a message, and allow Outlook to fill in the entire word for us.