Outlook 2010 by default auto saves emails as you type them every 3 minutes to prevent you from losing work. Many people don’t know the setting is actually adjustable and here’s how to configure it.
Open Outlook and Click File >> Options
Click the Mail tab and scroll down to the Save messages section. Adjust the minutes between auto saves as well as other settings like where to save the email drafts using the drop down under Save to this folder.