Quoting from the page you cited:
The folder must be in your default information store -- Exchange mailbox or PST file. The IsInDefaultStore() function tests for this. If you need to move items to a different folder, the solution would be to use the ItemAdd event on the Sent Items folder's Items collection and move items to the desired folder. See http://www.outlookcode.com/codedetail.aspx?id=456 for a code sample that demonstrates how to work with that event.

Signature
Sue Mosher, Outlook MVP
Author of Configuring Microsoft Outlook 2003
http://www.turtleflock.com/olconfig/index.htm
and Microsoft Outlook Programming - Jumpstart for
Administrators, Power Users, and Developers
http://www.outlookcode.com/jumpstart.aspx
>I have gone through most of the posts but have not found satisfactory
> solution for the following problem:
[quoted text clipped - 18 lines]
>
> Umesh
umeshu7@yahoo.com - 03 Mar 2006 21:47 GMT
Thanks. But the folder is a PST folder. So how do i make the archive
PST folder in "default information store".
Umesh
Sue Mosher [MVP-Outlook] - 04 Mar 2006 01:44 GMT
Sorry, but your last statement seems to be missing a verb or something. Could you try to rephrase it?

Signature
Sue Mosher, Outlook MVP
Author of Configuring Microsoft Outlook 2003
http://www.turtleflock.com/olconfig/index.htm
and Microsoft Outlook Programming - Jumpstart for
Administrators, Power Users, and Developers
http://www.outlookcode.com/jumpstart.aspx
> Thanks. But the folder is a PST folder. So how do i make the archive
> PST folder in "default information store".
>
> Umesh
Brian Tillman - 05 Mar 2006 19:26 GMT
> Thanks. But the folder is a PST folder. So how do i make the archive
> PST folder in "default information store".
You can't make an archive folder part of the default information store
without making the entire archive PST your default store and I don't think
you really want to do that.

Signature
Brian Tillman