Cannot sync Windows Mobile with outlook/office 2010 professional p

Cannot sync Windows Mobile with outlook/office 2010 professional pro (x64)

When I try to sync I get the message:

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Microsoft Office Outlook
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Either there is no default mail client or the current mail client cannot
fulfill the messaging request. Please run Microsoft Outlook and set it as
the default mail client.
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OK
---------------------------

But, Outlook is my default mail clinent.

I'm using Office 2010 Pro Plus (x64) running on Windows 7 (x64). And
downloaded and re-installed the latest Windows Mobile Center yesterday.

Any help would be greately appreciated.

Thanks,
Emilio