A. Aside from the native Exchange Connector, the X.400 connector is the most common Exchange connector, allowing Exchange to connector to non-Exchange systems. While X.400 suffers a 20% drop in performance in comparison to the native Exchange connector it is still impressive.

X.400 is a common standard and Exchanges implementation is based on the 1988 standard. X.400 operates on the MTA stack and has to be installed before installing a X.400 connector. MTA stacks are available for TCP/IP, X.25 and TP4. It is available for RAS as well but that stack does not support X.400. In this walkthrough we will look at implementing X.400 over TCP/IP.

Only Exchange Enterprise edition has the X.400 connector and not the standard edition (also Enterprise has the SNADS and OV/VM(PROFS) connectors which standard does not have). If you only have standard edition and require X.400 connector you will need to upgrade or purchase the X.400 connector as a separate product from Microsoft.

The first step is to install the MTA transport stack

  1. Start the Exchange Administrator program
  2. Select 'New Other' - 'MTA Transport Stack' from the File menu
  3. Select "TCP/IP MTA Transport Stack" from the list and the local server and click OK
  4. A dialog for the configuration of MTA will be shown. You can leave the OSI information blank. Under the Connectors tab leave blank. Make sure you enter a display and directory name. Click OK

If you find you don't have a number of MTA stacks check you installed the X.400 connector at installation time. Re-run setup and click Add/Remove. Select Exchange Server and click Change Options. Check the "X.400 Connector" box and click OK. Click Continue. You will now be able to install the TCP/IP MTA stack.

Now the MTA stack is installed you can install the actual X.400 connector and configure it accordingly.

  1. Start the Exchange Administrator program
  2. Select the Connections container of the required site to add the connection too
  3. Select 'New Other' - 'X.400 Connector' from the File menu
  4. Accept the default "TCP/IP X.400 Connector" and click OK
  5. The X.400 configuration dialog will be displayed. Under the General tab enter a display and directory name (this can be any string of text). You should enter the remote MTA name (and a password if required) which is used to identify the Message Transfer Agent on the other host/site.
  6. Click the Schedule tab to configure replication settings
  7. Select the Stack tab to enter the IP address of name of the system to connect to. Again you can leave the OSI information blank.
  8. Use the Override tab to specify a different local MTA name/password
  9. Connected sites is only used when connecting Exchange sites via X.400.
  10. If you don't enter anything under Connected Sites you must configure an address space under the "Address Space" tab
  11. Delivery Restrictions and Advanced all along other non-essential settings to be set
  12. Once all information is entered click OK

You now have a functionality one-way X.400 link. You would now need to repeat the above for the opposite directory.