How do I convert an mp3 or WMA file to a m4a file?

I read on another forum that iTunes can convert mp3 and wma files to m4a format.
How do I do this?

That is correct.
By default if you load a .wma file into iTunes, it will AUTOMATICALLY convert it to another format first, since it needs to in order to play it. However, you can also convert any other file format that iTunes supports, assuming it can get loaded into iTunes.
To set what format you want to convert to, go EDIT->PREFERENCES. Click the IMPORT SETTINGS button and select which encoder you want (AAC, MP3, Apple Lossless, AIFF, and WAV are supported) and then select the bit rate if you are choosing a lossy format (AAC/MP3).
From there, any .wma files you load into iTunes (you can do this by going into iTunes and selecting FILE-> ADD FILE TO LIBRARY, or simply right clicking a .wma file and OPEN WITH iTunes) will convert to that format. ALSO, if you have any other files already in iTunes you wish to convert, select the file(s), and go to ADVANCED -> CREATE ___ VERSION (the blank being whatever you selected before) and it will convert for you.
Remember, converting a lower quality song to a higher quality format/bit rate won't "up-covert" any quality, the lowest quality you start with is the highest you can possibly get, but if you still prefer to have a certain file format or bit rate to compress to, this is the feature you'd use!
Let me know if you have any other questions!

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How do I convert an mp3 or WMA file to a m4a file?

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