Assuming your regional settings have your short date format set to
mm/dd/yyyy, you should be able to use the CDate function to convert the text
to a proper date. (NOTE: I seldom recommend this approach, as it will not
work for users who have their short date format set to dd/mm/yyyy, and
therefore is not a generic approach!)
Since you can guarantee the format of the text date, though, another option
would be to write a function that parses the date into its component parts,
and uses the DateSerial function to convert to a date.
You can use either of these methods on a query based on your ODBC table, and
then use that query wherever you would otherwise have used the table.