NEW DELHI, July 29 (Reuters) - Russia-backed Indian

refiner Nayara Energy, recently sanctioned by the European

Union, has turned to domestic firm Rediff.com after tech giant

Microsoft ( MSFT ) suspended services, three sources familiar

with the matter said.

Nayara, which has condemned the sanctions, said on Monday it

had filed a case against U.S.-based Microsoft ( MSFT ) in the Delhi High

Court over its withdrawal of services.

The sources spoke on condition of anonymity as they were not

authorised to speak to media.

Nayara and Rediff did not immediately respond to requests

for comment.

Incorporated in 1996, Rediff India, headquartered in the

commercial capital of Mumbai, aims to provide world-class online

consumer service offerings, from news and email to an online

shopping marketplace, the company says on its website.