MOSCOW, June 4 (Reuters) - Russia's state anti-monopoly service said on Thursday it had launched a probe of Microsoft MSFT.O over cutbacks in supplies of its Windows XP operating system in Russia.

The agency said it thought Microsoft had violated antimonopoly legislation by cutting delivery of Windows XP operating system to Russia both separately and pre-installed on personal computers, as well as in its pricing policy on the product.

It said it would consider the case on July 24, 2009. (Reporting by Maria Kiselyova; editing by Melissa Akin)