Registrations are now open. Join us today!
There is still a lot of work to do on the wiki yet! More information about editing can be found here.
Already have an account?

Microsoft KB Archive/105106

From BetaArchive Wiki

PC WFW: Mail DoubleSpace and Highest Security Options

Q105106



The information in this article applies to:


  • Microsoft Mail for Windows for Workgroups, version 3.11





SUMMARY

In version 3.11 of Microsoft Windows for Workgroups Mail, there are additional menu items not supplied in the retail package of Microsoft Mail for PC Networks.

Under the Mail Options menu, there is a section titled Optimize Local Mail File. There are two choices listed:

DoubleSpace
Highest Security

These two choices are specific to version 3.11 of Microsoft Windows for Workgroups mail, and are only available when you are running Windows for Workgroups under MS-DOS version 6.0 or higher.



MORE INFORMATION

DoubleSpace is considered to have less encryption (less security) but better performance (speed) than Highest Security. DoubleSpace is only available with MS-DOS version 6.0 or higher.

The Highest Security option uses the same Mail Message File (MMF) encryption algorithm used by Microsoft Mail for PC Networks. Highest Security is not as fast as DoubleSpace because time is taken to encrypt or decrypt the .MMF file.

The DoubleSpace encryption is built into DoubleSpace itself. You cannot copy a file off of a DoubleSpace drive, import it to a different computer, and easily read the file. Because the file allocation table (FAT) system is cluster based, DoubleSpace uses its own FAT [which is called the Microsoft DoubleSpace FAT (MDFAT)] to achieve sector allocation. This encryption option is fast; however, it is not as secure as the encryption algorithm used in the Highest Security setting.

For more information on DoubleSpace, see pages 118-136 in the MS-DOS "User's Guide" and Chapter 3 of the MS-DOS "Technical Reference."

Additional query words: double space WFW WGPO

Keywords :
Issue type :
Technology : kbMailSearch kbWFWSearch kbWFW311


Last Reviewed: November 21, 1999
© 2001 Microsoft Corporation. All rights reserved. Terms of Use.