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MSMail aka Workgroup Post Office (WGPO) is not supported on Outlook 2002 and 2003.

But it can be made to work. As always it's in an unsupported mode.

Instructions for Outlook 2002 are at Add MS Mail and an installer is available for OL2002.

Now available - an installer for Outlook 2003! This is for Outlook 2003 only - use the other one for Outlook 2002. If you only need the WGPO files, use the Outlook 2002 version. Thanks to Ken Slovak  for creating the installer file for me. (Please do not contact him for assistance - he doesn't know anything about MS Mail, he made the installer file as a favor for me.)

What this installer does:

1. Makes the changes needed to the mapisvc.inf file (see below).
2. Installs MSFSMENU.ECF and MSFSPROP.ECF to C:\Program Files\Microsoft Office\OFFICE11\ADDINS
3. Installs the post office administration files (wgpo*.*) to Windows\system32. (Delete them if you don't want users to see them in control panel.
4. Installs MSFS32.DLL to Windows\system32
5. Adds the ability to uninstall from Add/Remove programs

Everything seems to work perfectly when you upgrade over a previous version of Outlook, however when doing a clean install the MS Mail address book returns an object not found error when resolving addresses against it. You can work around this one of two ways.

1. By adding the other members of your post office to your contacts folder. Replying to mail works fine as do addresses in the autocomplete cache - you just can't use the MS Mail address book to resolve addresses.
2. Create a new *.pst using Outlook 97/2002 format. Using the new Unicode format appears to cause the error.

To easily add the contents of the address book to your Contacts folder, open the Address book to the Postoffice address book. Select all names and right click, then choose Add to Contacts. You can now send mail to your MSMail address list.

To make a new pst, open the profile dialog (from Outlook use Tools, E-mail Accounts, View or change existing email accounts or  access it from Control Panel, Mail). Select New Outlook Data file at the bottom of the screen and create a new one using Outlook97/2002 format, then set it as the default delivery location. You'll need to restart Outlook for the change to take effect.

You may need to restart Outlook to see mail in newly created shared folders.

If you want to install MSMail yourself, do the following:

Add
1. MSFS=Microsoft Mail
to the [Services] section of
C:\Program Files\Common Files\System\MSMAPI\1033\mapisvc.inf

2. Add this to the end of mapisvc.inf (watch for broken lines - each line begins with PR_, except the last 3):

[SFS_AB]
PR_PROVIDER_DLL_NAME=MSFS.DLL
PR_SERVICE_INSTALL_ID={6485D278-C2AC-11D1-AD3E-10A0C911C9C0}
PR_RESOURCE_TYPE=MAPI_AB_PROVIDER
PR_DISPLAY_NAME=Microsoft Mail Address Book
PR_PROVIDER_DISPLAY=Microsoft Mail Address Book
PR_RESOURCE_FLAGS=STATUS_PRIMARY_IDENTITY
[SFS_MS]
PR_PROVIDER_DLL_NAME=MSFS.DLL
PR_SERVICE_INSTALL_ID={6485D278-C2AC-11D1-AD3E-10A0C911C9C0}
PR_RESOURCE_TYPE=MAPI_STORE_PROVIDER
PR_DISPLAY_NAME=Microsoft Mail Shared Folders
PR_PROVIDER_DISPLAY=Microsoft Mail Shared Folders
PR_RESOURCE_FLAGS=STATUS_NO_DEFAULT_STORE
34140102=00ffb8646041b80108002b2b8a290000
[SFS_XP]
PR_PROVIDER_DLL_NAME=MSFS.DLL
PR_SERVICE_INSTALL_ID={6485D278-C2AC-11D1-AD3E-10A0C911C9C0}
PR_RESOURCE_TYPE=MAPI_TRANSPORT_PROVIDER
PR_DISPLAY_NAME=Microsoft Mail Transport
PR_PROVIDER_DISPLAY=Microsoft Mail Transport
PR_RESOURCE_FLAGS=STATUS_PRIMARY_IDENTITY
[MSFS]
PR_SERVICE_INSTALL_ID={6485D278-C2AC-11D1-AD3E-10A0C911C9C0}
PR_DISPLAY_NAME=Microsoft Mail
PR_SERVICE_DLL_NAME=MSFS.DLL
PR_SERVICE_SUPPORT_FILES=msfs.dll
PR_SERVICE_ENTRY_NAME=ServiceEntry
;WIZARD_ENTRY_NAME=WizardInformation
PR_RESOURCE_FLAGS=SERVICE_SINGLE_COPY
Providers=SFS_AB, SFS_MS, SFS_XP

3. Add MSFS32.DLL to
C:\WINNT\system32\

You will also need two ecf's, MSFSMENU.ECF and MSFSPROP.ECF placed in C:\Program Files\Microsoft Office\OFFICE11\ADDINS

if you need the post office files, use the installer for Outlook 2002 and only install the Post office files.

Restart Outlook and possibly the computer.