Dragon Systems has stopped developing NaturallySpeaking, its voice recognition software, for the Mac.

The company said it will make a final decision on continuing Mac development after Apple ships OS X to developers later this year.

Dragon Systems announced a Mac-compatible version during Apple's worldwide Developer Conference last May. It expected to ship the software by the end of 1999.

Since then, IBM has begun shipping its ViaVoice speech recognition software for the Mac. IBM also appeared with Apple at several high-profile Macworld Expos.

A report on Macweek says that an engineer demonstrating a beta of NaturallySpeaking at last Autumn's Comdex admitted that the company had faced unexpected challenges developing the Mac version. This was partly due to differences in the way Mac OS and Windows handle memory.