This article describes how to hide the BCC checkbox in the OWA 2010 message options dialog.
First, look for the messageoptionsdialog.aspx file in the C:\Program Files\Microsoft\Exchange Server\v14\ClientAccess\Owa\forms\premium folder. Make a copy of it (important if something goes wrong), and then open it in Notepad. Press F3 to begin a search, and find the text chkBcc. You should find a line that starts like this:
<input type="checkbox" id="chkBcc">To hide this line, we can put it in a <span> element, and change the visibility style to "hidden", like this
<span style="visibility:hidden"> <input type="checkbox" id="chkBcc"> </span>
Save the changes, and next time you compose a message in your OWA, the BCC checkbox should not be shown.
As with most of these type of modifications, you will need to check that they still function after each product update. Sometimes your modified file will be replaced by a new one from the update.
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