I've tried it. Still use somethings. You will have to relearn the functions. The major problem is you can convert a Microsoft file to Open Office but not the other way around.
One cheap way to get Office if you know anyone going to college is this program: http://www.microsoft.com/student/discounts/theultimatesteal-us/default.aspx
$59.95 for the full Office Professional which is usually over $400.
1. You must have a valid e-mail address at an educational institution ending with the domain suffix .EDU (ie, leina@contoso.edu) OR have a valid email address at one of the educational institutions listed here.
AND
2. You must be a student at a U.S. educational institution and must be actively enrolled in at least 0.5 course credit and be able to provide proof of enrollment upon request.