Unable to Access OWA from Windows Mobile Device

We're running Exchange Server 2003 SP2 and publishing OWA through ISA.  I just upgraded from ISA 2004 to ISA 2006 yesterday and since the upgrade, on my Windows Mobile device, if I try accessing OWA through Internet Explorer the site does not come up and I receive "Error Code: 500 Internal Server Error".  This didn't happen under ISA 2004; it just started happening yesterday under ISA 2006.  How do I correct this?
karinerivetAsked:
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karinerivetConnect With a Mentor Author Commented:
I determined that if I use the default HTML form which presents the ISA logon screeen I'm able to access OWA from my Windows Mobile device and if I use the custom Exchange HTML form which presents the OWA logon screen I'm unable to access OWA from my Windows Mobile device.  That understanding is acceptable as I don't need to access OWA from my Windows Mobile device, but does anyone know why it works that way and whether there is a way to make the custom Exchange HTML form work with OWA on Windows Mobile devices?
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