Exchange 5.5 and Dialup

Yes, it is possible. You need to specify the dial-up account to use in the Exchange Administrator program and IMC. see this at microsoft: http://support.microsoft.com/default.aspx?scid=kb;en-us;Q155828 .It is a good idea to set exchange to automatically dial up every 30 mins or so to collect mail, and to hang up when it has finished sending and receiving. Be aware that 5.5 does sometimes have problems with the dial-up connecting but not retreiving any mail.