To work around this behavior, create a new Exchange HTTP
		  virtual server to handle the public folders. To do this, follow these steps:
		  
- On the Exchange server, start the Microsoft Exchange System
				Manager utility.
 - If administrative groups are enabled, expand
				Administrative Groups, and then expand the administrative
				group that contains the Exchange server where you want to create the new
				Exchange HTTP virtual server.
 - Expand Servers, expand your Exchange
				server, and then expand Protocols.
 - Right-click HTTP, point to
				New, and then click HTTP Virtual
				Server.
 - In the Name box, type a descriptive name
				for the Exchange HTTP virtual server, and then click
				Advanced.
 - Click the identity, click Modify, change
				the TCP port value to 81, and then click
				OK two times. 
 - Under Exchange path, click Public
				folder, and then click OK.
 - Verify that the new Exchange HTTP virtual server is working
				correctly. To do this, start a Web browser program, and then enter the
				following URL:
http://localhost:81
 - On the server that is running Microsoft Windows SharePoint
				Services 2.0, start the SharePoint Central Administration utility.
 - Click the Configure virtual server settings from
				the Virtual Server List page link.
 - Click the Windows SharePoint Services virtual server that
				you want to configure. For example, click Default Web
				Site.
 - Under Virtual Server Management, click the
				Virtual server general settings link. 
 - In the E-Mail Enabled Document Libraries area, enter the
				new Exchange HTTP virtual server information in the Public folder
				server and root path box, and then click
				OK.