If you go to the "Preferences" dialog box in iTunes (under the Edit menu), click on the 'Advanced' tab, then on the 'Importing' tab you'll see the choices for importing files. The possiblities are AAC, AIFF, Apple Lossless, MP3 and WAV.
If you import WMA files into iTunes, and you have set the iTunes preferences to use Apple Lossless as the import format, iTunes will convert the files on import, after asking your first.
In the "View options" dialog box under the "View" menu you can click on "Kind" and the file type will show up as one of the columns you see alongside each song that's been imported, a nice feature if you have a mix of file types because you can use that column to sort the songs.
If you import WMA files into iTunes, and you have set the iTunes preferences to use Apple Lossless as the import format, iTunes will convert the files on import, after asking your first.
In the "View options" dialog box under the "View" menu you can click on "Kind" and the file type will show up as one of the columns you see alongside each song that's been imported, a nice feature if you have a mix of file types because you can use that column to sort the songs.