WMV conversion to Quicktime

I recently switched from PC to and iMac desktop. I love the new system but am still learning. My problem is that I have a lot of movies in WMV format that will not play on my Mac. I see that there are a lot of conversion softwares available but I want to be sure to get the right one. I sometimes get email with
WMV attachments which I cannot view. Can anyone recommend a good conversion software or process? I have Lion installed and the flip for mac software does not work.

Perian and VLC will help QuickTime view those files. As well as many other file types.

wmv conversion

Thanks. VLC worked but Perian didn't. I appreciate the help.

He meant Flip4Mac WMV Player (free).