This 3rd Party utility looks like what you need.
It has a "Download and Try" link, not sure how functional it will be.
Besides doing one-by-one or using a 3rd Party tool, I don't think there's any other way.
EDIT - This looks like it's only crutch w/o buying the whole thing.
Quote:
Thank you for trying 'Convert Doc'.
The installed version will work correctly for 30
iterations before disabling itself. To unlock this
shareware behavior, put the appropriate
registration key in the Help\About menu. This
key is given upon purchase.
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