Well, for starters, it's going to want a year.
I don't have 2k8 handy to run a direct test for datetime2, but stripping off the 'day of week' at the beginning by grabbing everything after the first comma, then appending ', 2010' to the end of the result should fix the issue.
IE: CAST( RIGHT( datefield, len(datefield) - charindex( ',', datefield)) + ', 2010' AS DATETIME) should work.
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