RealNetworks also challenged Microsoft's claims regarding WMA's superior audio quality compared to RealAudio.
The former claim however was rejected by some audiophiles. Microsoft claimed that WMA could produce files that were half the size of equivalent-quality MP3 files Microsoft also claimed that WMA delivered "near CD-quality" audio at 64 kbit/s. It was later officially released as Windows Media Audio, as part of Windows Media Technologies 4.0. The first finalized codec was initially referred to as MSAudio 4.0. Malvar was a senior researcher and manager of the Signal Processing Group at Microsoft Research, whose team worked on the MSAudio project. The first WMA codec was based on earlier work by Henrique Malvar and his team which was transferred to the Windows Media team at Microsoft.
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