Outlook 2007 not saving autocorrect options

[Ed]

Using Outlook 2007, I turn off the "Capitalize first letter of sentences" in
the AutoCorrect tab. This setting works for subsequent email, but is not
saved if I close Outlook and restart it. I want to make the change stick.

I have made a similar change in Word 2007 and while the setting does get
saved within Word, it does not seem to affect Outlook.