From the Tools menu, choose AutoCorrect Options.
Clear the check box labeled: Capitalize the first letter of sentences.
Review the other options while you're there.
Also while there, try creating yourself some quickie AutoCorrect shortcuts
using brief non-words. For example, when I type ph and a space or
punctuation, the "ph" is replaced with my phone number. Similarly, I've set
"em" to be my email address, fe becomes "for example", and so on. Invent your
own for long words or phrases you write often.
