There is no Auto-Response in Windows Mail. You can create one though.
If you do this, you will have to leave your computer on 24/7, be connected
to the Internet, and have your e-mail program open. If you want do this
anyway, the link below will explain how to do it. One thing I would
suggest is that where it says to create a rule and check For All Messages,
you change it and make the rule for people in your address book only.
Otherwise you will be replying to Spam as well and could end up in an
endless loop of bounces.
***Most ISPs/Mail Servers offer this service which would be a better
choice.***
How to Set Up a Vacation Auto-Response in Windows Mail, Outlook Express,
or Windows Live Mail
http://email.about.com/od/windowsma...sponse_in_Windows_Mail_or_Outlook_Express.htm
Configuring Outlook & Outlook Express To Auto Respond to Incoming E-mail
http://www.onecomputerguy.com/app_info/outlook_autoresponse.htm