This directory contains the PostgreSQL ODBC driver (psqlODBC) in a variety of
different formats for convenience. In each directory, you will find various
versions of the driver in the format for that directory. Unless you have
have a specific reason not to do so, you should always download the latest
version.

dll/

  This directory contains the driver dll's and documentation in a simple zip
  archive. Only use this distribution if you know what you are doing!

mm/

  This directory contains the driver and supporting dlls (but not the 
  documentation) in a Windows Installer Merge Module for inclusion in third 
  party installers.

msi/

  This directory contains the driver and documentation in a Windows Installer
  package. Most Windows users probably want this package.

old/

  This directory contains archaic versions of the driver kept purely for 
  historic reasons.

src/

  This directory contains the driver as a source code tarball. Most *nix users
  will want this version.