How can I require or convert to uppercase letters in text boxes on a form? Some special characters are allowed.

Thanks ahead for any help!

If you are talking about converting to upper case in data entry, try using the After Update event of the textbox:

Private Sub YourTxtBox_AfterUpdate()
Me.ActiveControl = UCase(Me.ActiveControl)
End Sub

If you are refering to viewing previous data that you want to see as upper case then try:

Using a field called "Name" from the table/query as an example:

In the Control Source of the text box put:
=Ucase[Name]

HTH
RDH