PC WFW: Mail DoubleSpace and Highest Security Options
ID: Q105106
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The information in this article applies to:
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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 :
Version : :3.11
Platform :
Issue type :