As you already read - OE doesnt have an out of office feature...
Outlook does, and actually, you DONT have to be on an exchange server - the
problem is, if you set ANYTHING like this up on your client, your computer
has to be turned on with some program running to enable the out of office
assistant - thats why you are better off getting something from your isp -
back at the server.
Lots of people do just that, then they go away, cant figure out why nothing
works. When they return, their mail comes in and THEN the oooa kicks in and
confuses the crap outta everyone.