The Wall Street Journal (WSJ) claims sales of Apple's Mac OS X are too slow for Microsoft.

According to MacCentral, the article discussed Microsoft's displeasure regarding Mac OS X software sales and Apple's promotion of its operating system.

Microsoft has sold 300,000 copies of Office v.X so far – against a 750,000 sales target the company hopes to achieve by November – the report claims. The Journal warns Microsoft may reconsider its business with Apple if sales don't improve.

Microsoft .Net partner Corel is also critical of OS X software sales, accordingt o the WSJ. However, Adobe sees a different trend – its experiencing increased sales.

Apple claims 2.5 million Mac OS X users, predicting 5 million by the end of the year.