Mac Outlook 2011 Error 18500

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    Hi.
    My client is running SBS 2011/Exchange 2010.  He is running on a Mac with Outlook 2011

    The mac is able to RECEIVE email just fine from the exchange server.
    However, the Mac CANNOT SEND any email.  Just sending a short 1 word email, with no attachment, gives the error:

    "HTTP error. The server cannot fulfill the request.
    Details
    ----
    Mail could not be sent. The message has been moved to your Drafts folder.
    Error -18500"

    I *really* hope someone can help!  I''m stumped.

    TIA,
    jim
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