Not sure this will help, but there is some information that may help you locate the proper setting.
http://technet.microsoft.com/en-us/library/dd298140.aspx
urimi.
the title of this thread states you are attempting to send an attachment. What is the file extension of the attachment? What is the current file size of this attachment? The error could suggest the original contents were modified.
Look forward to hear back form you.
Its possible you have logged into OWA under the lite version. Try opening your OWA portal using Internet Explorer.
If this did not resolve your issue, please update me on what your trying to accomplish.
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