<P> EFS is available in all versions of Windows developed for business environments (see Supported operating systems below) from Windows 2000 onwards . By default, no files are encrypted, but encryption can be enabled by users on a per - file, per - directory, or per - drive basis . Some EFS settings can also be mandated via Group Policy in Windows domain environments . </P> <P> Cryptographic file system implementations for other operating systems are available, but the Microsoft EFS is not compatible with any of them . See also the list of cryptographic file systems . </P> <Table> <Tr> <Td> </Td> <Td> This section does not cite any sources . Please help improve this section by adding citations to reliable sources . Unsourced material may be challenged and removed . (February 2010) (Learn how and when to remove this template message) </Td> </Tr> </Table> <Tr> <Td> </Td> <Td> This section does not cite any sources . Please help improve this section by adding citations to reliable sources . Unsourced material may be challenged and removed . (February 2010) (Learn how and when to remove this template message) </Td> </Tr>

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