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Red X in Outlook Web Access

You may not be able to compose a new message or reply to an email in Outlook Web Access when using Vista or Windows 7. A red "X" will be shown where the editor should be.

This behavior occurs because Windows Vista no longer includes support for the ActiveX control that is used for HTML editing in Outlook Web Access.

To fix it, just install hotfix 911829 on the server running Exchange Server 2003. This hotfix requires Exchange Server 2003 SP2 or later.

This does not apply to Exchange 2007.