how to rewrite this SQL statemen in SQL 2005

how can i rewrite this access query in SQl 2005?

UPDATE APPOPTION LEFT JOIN ConvertedAccts ON [APPOPTION].ACCT_BETA = ConvertedAccts.[PERACCT]
SET [APPOPTION].ACCT_BETA = [ConvertedAccts].[NFSACCT]
WHERE (((ConvertedAccts.[PERACCT])=[APPOPTION].[ACCT_BETA]));