Can´t get Calendar working using WebDav protocol

Hi !

We've configured km notifications using an smtp server succesfully, but now we are trying to integrate Microsoft Exchange 2000 using the WebDav protocol so to use the calendar functionality.

We carefully followed the steps in the help:

1. Publish the Custom Form provided by SAP.

2. Create and configure a WebDAV Transport.

3. Configure the Calendar Repository Manager.

But when i click in "User Details -> Show Avaibility" it shows the message:

I don´t really understand what this error means and i couldn´t find any help neither in the sdn nor in the help.sap.

Please help!

Best regards, Marco.