Changing "When posting to this folder use" from code?

[Munsifali Rashid]

Hi,

Does anyone know if it's possible to change the the "When posting to this
folder use" option from code? I've got an ASP.NET Webservice running on the
Exchange server. There's a webmethod which creates public folders.
However, I need to change which form is used to post to the folder, so that
when posted to in Outlook, the custom form is used.

I've read that this can be accomplished via MAPI Extended Properties, but
I'd prefer to avoid this route, because for it to work, Outlook will have to
be installed on the Server, which I'd like to avoid. Is there any other way
to achieve this?

Any advice would be most appreciated. Thanks.

Mun