NEW DELHI, July 28 (Reuters) - Russia-backed Indian

refiner Nayara Energy Monday said it has started legal

proceedings against Microsoft ( MSFT ) following the abrupt and

unilateral suspension of critical services by the

U.S.-headquarterd software giant.

"Microsoft ( MSFT ) is currently restricting Nayara Energy's access

to its own data, proprietary tools, and products-despite these

being acquired under fully paid-up licenses," the refiner said

in a statement.