Information about Andrew Computing Services [CMU's central IT organization] is available from the Andrew web site. The Andrew Support Contacts page describes whom to contact for help, and how to best communicate with each of the groups that support Andrew Services.
Information about the School of Computer Science’s Computing Facilities can be found on the SCS Computing Facilities web site.
Videos and training material from lynda.com are available fee-free 24/7 by clicking the red Login button in the center of the www.cmu.edu/lynda web page. Login with your Andrew userID and password. Over 1100 courses and 65,000 tutorials cover a wide variety of software packages. You can find short courses on Outlook 2010 (Windows), Outlook 2011 (Mac OS X), Windows 7, Mac OS X, Excel, and many other topics.