Software giant Microsoft is launching its own online music store to rival services by Apple and Napster. Microsoft will launch the store this autumn via its MSN service in the US, but it would not say whether it planned a sales or subscription service. It unveiled the service at the South by Southwest music conference in Texas. Retail giant Wal-Mart is also launching its own US music download service after a three-month test, offering songs at $0.88 (0.48) each. Read More . . .