there is an Access built-in function that applies "proper case", meaning the
first letter of every word is capitalized - and all other letters in the
word are lower case. and of course Access has a function to force *all*
upper case letters. but there is no built-in function for anything like
"sentence case" - first letter of every sentence.
you could build your own function, something along the lines of
If Not IsNull(Me!ControlName) Then
Me!ControlName = UCase(Left(Me!ControlName, 1)) _
& Right(Me!ControlName, Len(Me!ControlName)-1)
End If
run the code in the control's AfterUpdate event procedure.
hth