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Installation

Installation is in two parts:
First you must install GnuPG (GNU Privacy Guard) or PGP. PGP is commercial software available at http://www.pgp.com . Here, we assume you will want to use the free GNU alternative.

Installing GnuPG

Goto the GnuPG website at http://www.gnupg.org , goto the download page and follow the links to a local mirror site where you will find the Win32 self-installing binary in the binary directory: gnupg-w32cli-1.4.5.exe.
Note that the version number is written into the file name and the file you download may be later and have a slightly different name.
It is always wise to verify the checksum of the downloaded file. gpg signatures and SHA-1 checksums are given on the GnuPG website. Verify using GnuPG itself or download either the md5sum or sha1sum program.
Run the downloaded executable and follow the installation instructions.
Create your public/private key pair. The documentation links at http://www.gnupg.org give full details but it is simply a matter of opening a command window (DOS box) and entering the command line
gpg --gen-key
You will be asked to enter your passphrase. It is important to choose something that is quite long, longer than a typical 6 letter password, but that you can easily remember and type. A line from a poem, perhaps. You will need to remember which letters are capitalized and omitting spaces is advisable.

Installing OpenPGP for Outlook

Download the source by clicking this link and saving the ZIP file to a suitable folder on your local disk openpgp.zip .
Extract the source; two sub-folders will be created: op4ec and source. op4ec is specific to the Outlook add-in, source is common stuff.

Verify the file after download against one of these checksums:
MD5 1C 8A 51 01 A5 FB DE 55 66 38 AC 7E B1 06 8E 3F

SHA1 E8F5 182E 6B17 3BC1 4967 4BAF 0343 1F60 A0FF 5DD8

You can use GnuPG to compute the checksum of the downloaded file, e.g.
gpg --print-md sha1 openpgp.zip
Build the add-in as a DLL with MSVC6. The Visual Studio project is op4ec.dsw.
Move the DLL to a suitable location on your computer and run it with the command line:
regsvr32 $path$\op4ec.dll.
Replacing $path$ with the actual location of op4ec.dll on your system. This will add a registry entry for the Outlook add-in under
HKEY_LOCAL_MACHINE\Software\Microsoft\Exchange\Client\Extensions
Note that you will need administrator priviledges to run this.
Start MS Outlook.
Select Tools/Options from the main menu.
Select the Other tab.
Click on Advanced Options...
Click on Add-In Manager...
Check the box next to Outlook OpenPGP add-in.

Verify the file after download against one of these checksums:
`MD5`	`1C 8A 51 01 A5 FB DE 55 66 38 AC 7E B1 06 8E 3F`
`SHA1`	`E8F5 182E 6B17 3BC1 4967 4BAF 0343 1F60 A0FF 5DD8`

Configure OpenPGP for Outlook

In this version, the OpenPGP menu is only displayed in a message view window.

Open a mail message or create a new one.
Select Options from the OpenPGP menu. Click the Set... button in the Options dialog and set the path to the GnuPG executable (gpg.exe).
Set other options as required.