How To Hide The BCC Checkbox (And Input Field) In Microsoft Exchange 2010 Outlook Web App.
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 close the file.
Now, we do something similar to the compose form in the basic client. As before, the safest (most easily reversible) way is to hide the elements, rather than delete them. Look for the basiceditmessage.aspx file in the C:\Program Files\Microsoft\Exchange Server\V14\ClientAccess\Owa\forms\basic folder, and then open it in Notepad. Press F3 to search for the text txtbcc. You should find it on a line that starts like this:
move the cursor up two lines to this line
and simply change it to
Save the file and close it.
Now, the 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.