In attempting to retrieve data from a Paradox database using the Jet OleDB provider, I ran into a strange issue, whereby the data could be retrieved succesfully using a console app, but the identical code would error when executed in a web-service method.
The problem turned out to be permissions. By using the <impersonate> tag in the web-config of the web-service, and specifying a relevant account, the web-service method worked.
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