Getting an error when sending an email notice using Nant

"Macdiarmid, James D." <[email protected]> Tue, 14 Jun 2011 11:50:30 -0400
Newsgroups gmane.comp.windows.dotnet.nant.user
Message-ID <F7A8C27240D1154593A0F16214BF0BBD02B00D2D@0015-its-exmb14.us.saic.com>
Library not registered. (Exception from HRESULT: 0x8002801D
(TYPE_E_LIBNOTREGISTERED))

Anyone seen this before?   I'm trying to connect to MS Exchange Server.
I've been google'ing this for a bit now but most of what I'm seeing
doesn't relate to Nant.

Thanks

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