Milly,

I am a idiot, your instructions work perfectly if you read and follow them.
I got frustrated when I clicked on the link to download the software because
it took me back to the same site I had been to multiple times. The key to
your responce is to follow the directions below step one in the URL you
provided.

Double-click pfbackup.msi and follow the prompts to install it.
In Outlook 2007, choose Tools | Trust Center and choose Add-ins from the
navigation list on the left.
At the bottom of the Add-ins screen, under Manage, select COM Add-ins and
click Go.
On the COM Add-ins dialog, click Add and navigate to the C:\Program
Files\Microsoft Office\OFFICE12\ADDINS folder. Select outbak.dll and click
OK. When you return to the COM Add-ins dialog, you should see a new entry,
Outlook Backup Addin, with its check box checked.
Click OK to close the COM Add-ins dialog.

You might try this;
The add-in may not be registered correctly. So, try registering the dll with
the following steps.

1. Exit Outlook.
2. On the Start menu click Run
3. In the Open box type the following and click OK.

  regsvr32 "c:\program files\microsoft office\office\addins\outbak.dll"

NOTE: You may need to adjust the above path to Outbak.dll to match the
location on your computer.

4. After running the command line start Outlook.
- The above frm an earlier post -

Also see http://support.microsoft.com/default.aspx?scid=kb;en-us;810932