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This article describes how to remove the 'Use Outlook Web Access Light' option on the Exchange 2007 OWA Forms-Based Authentication logon page. As usual, there's no built-in way to do this, but it's possible with a fairly simple modification to the FBA page source.

First, look for the OWA 2007 FBA logon.aspx file in the C:\Program Files\Microsoft\Exchange Server\ClientAccess\Owa\auth folder. Make a copy of it (important if something goes wrong), and then open it in Notepad. Press F3 to search for text, type chkBsc, then Enter. You should see a few lines that begin like this:

<tr>
  <td><input id="chkBsc" type="checkbox" class="rdo" onclick="clkBsc();" disabled...
  <td nowrap><label for="chkBsc"><%=LocalizedStrings.GetHtmlEncoded(Strings.IDs...
</tr>

If you delete these lines, the checkbox will not appear; but the safest way to remove it (in case you want to undo this in the future) is to place HTML comment tags (<!-- and -->) around the <tr> and </tr> tags . After doing that, the section of code should look like this:

<--<tr>
  <td><input id="chkBsc" type="checkbox" class="rdo" onclick="clkBsc();" disabled...
  <td nowrap><label for="chkBsc"><%=LocalizedStrings.GetHtmlEncoded(Strings.IDs...
</tr>-->

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.