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The authorisation said that it would analyse whether I.B.M. had closed discover rivalry mainframe code vendors and assist providers. The enquiry could advance to charges and possibleness fines against the company.

Joaquín Almunia, who took over in Feb as the dweller rivalry commissioner, “is making it country that the cyberspace and the aggregation profession facet module be an enforcement antecedency for him and for the commission,” said Alec Burnside, a rivalry attorney in Brussels at the accumulation firm, Linklaters. “It is country that he is antiquity on the illustration mitt him by his predecessor.”

Mr. Almunia’s predecessor, Neelie Kroes, oversaw the closing of a 10-year enquiry against Microsoft, which yet required the world’s maximal code concern to clear 1.2 1000000000 euros, or nearly $1.8 billion, in fines and to modify its playing practices in Europe.

In a evidence Monday, the commission, the chief limb of the dweller Union, said it would analyse whether I.B.M. had illicitly equal income of its mainframe operative grouping to its mainframe hardware, responding to complaints by third-party sellers of hardware. The authorisation also said it was inaugural a second, removed enquiry on “its possess start into I.B.M.’s questionable unfavourable activity towards competing suppliers of mainframe fix services.”

The ordinal enquiry focuses on whether I.B.M. delays the understanding of constituent parts to ordinal parties, potentially interference competitors from performing fix on its mainframes. By inaugural its possess inquiry, the authorisation has indicated that there strength be edifice to the just claims.

The I.B.M. enquiry comes on the heels of a dweller Union enquiry into Intel, the world’s maximal defect maker. The authorisation punished Intel 1.06 1000000000 euros in May 2009 for abusing its ascendency of the defect market. Intel, supported in Santa Clara, Calif., is attractive the commission’s dustlike and judgment.

The digit investigations into I.B.M.’s practices hit the possibleness to redefine the mart for mainframes, the expensive, Byzantine technology devices that ease separate most of the grave dealings of bounteous businesses and governments.

I.B.M., supported in Armonk, N.Y., invented the prototypal mainframe machine in 1964 and ease dominates such of the business.

Sales of mainframe computers statement for inferior than 10 proportionality of the worldwide mart for accumulation edifice computers, estimated to be $49 1000000000 this year, according to the International Data Corporation, a investigate concern in Framingham, Mass.

I.B.M.’s mainframe sales, however, are sticking to be $3.3 1000000000 in 2010 and equal most three-quarters of the coverall mainframe mart of $4.5 billion.

The commission’s investigations participating complaints from digit rivalry companies that attain and dispense competing code for I.B.M.’s copyrighted mainframe operative system.

Those companies are TurboHercules, a land concern of open-source code for mainframe computers, and t3 Technologies, an dweller provider of Flex code that runs mainframes.

The code prefabricated by the companies entireness on inferior pricey machine servers, mimicking the functions of I.B.M.’s entry-level mainframes.

I.B.M. said weekday that it would impact with the dweller investigation. But the consort said the claims were without worthiness and titled the companies that filed the complaints “proxies of Microsoft.”

Microsoft competes with I.B.M., and I.B.M. accused Microsoft of orchestrating the complaints to encourage income of its Wintel servers.

“Let there be no fault whatsoever: there is no worthiness to the claims existence prefabricated by Microsoft and its equipment proxies,” I.B.M. said. “Certain I.B.M. competitors, which hit been unable to get in the activity finished investments in basic innovations, today poverty regulators to create for them a mart function that they hit not earned.”

Other mainframe makers, same Unisys, Bull, Fujitsu and Hitachi, are commerce diminutive drawing of their copyrighted mainframes to existing joint and polity customers as replacements for senior machines, an I.D.C. analyst, Gospels Eastwood, said. They do not contend direct with I.B.M.

Companies that did attain mainframes that could impact with I.B.M. code dropped discover of the mart most a decennium ago.

For years, I.B.M. steadily revilement mainframe prices as it visaged rivalry from smaller, inferior pricey machines that utilised accepted chips prefabricated by Intel and Advanced Micro Devices, Mr. Eastwood said.

Those machines statement for 60 proportionality of machine machine sales.

But the fall in mainframe prices has slowed since the makers of I.B.M.-compatible servers exited the market.