Windows 95 build 320

4.00.320
Build of Windows 95
OS familyWindows 9x
Version number4.00
Build number320
Architecturex86

Windows 95 build 320 is a build of Windows 95 which is mentioned in the release notes for build 323.

There is NO interoperability between M7 and the 320 releases.  You cannot
send/receive messages to/from mismatched Windows 95 releases.  Upgrade all M7
Microsoft Exchange users simultaneously to use Microsoft Exchange 320.
IMPORTANT NOTE: Your profile from M7 will no longer work with 320, and
should be deleted.