cannot open Notes in OWA 2007

Issue: customer reported not being able to open notes from OWA 2007, using Internet Explorer

Synopsis: Customer creates a note in outlook 2007. tries to open the notes using external servername from Internet explorer. The error below is displayed, trying to access the note

Exception type: System.Web.HttpCompileException
Exception message: c:\Program Files\Microsoft\Exchange Server\ClientAccess\Owa\forms\CommVault\readmessage.aspx(35): error CS0154: The property or indexer 'Microsoft.Exchange.Clients.Owa.Core.UserOptions.ComposeFontName' cannot be used in this context because it lacks the get accessor

Note that Customer can open this note if using Chrome or Firefox browsers respectively

Workaround Solutions:

The external servername sends traffic through the ISA server. We are trying to figure out a way to resolve this

workaround solution A:

use firefox or Chrome browser

Workaround solution B:

if customer is using Internet explorer, advise customer to use https://externalservername/owa to access webmail

Note: This issue applies to OWA 2007(webmail) users