SEATTLE (AP) â€” Hackers broke into Microsoft Corp.'s computer network and gained access to blueprints for the company's latest software, Microsoft said Friday. The FBI is investigating.
FBI spokesman Steve Berry refused to describe the nature of the investigation, however.
``They did in fact access the source codes,'' the company's chief executive, Steve Ballmer, said during a meeting in Stockholm. ``You bet this is an issue of great importance.
``I can also assure you that we know that there has been no compromise of the integrity of the source codes, that it has not been tampered with in any way.''
The source code contains the blueprints for such products as the Windows operating system.
``We're still looking into it. We're still trying to figure out how it happened,'' said company spokesman Rick Miller said. ``This is a deplorable act of industrial espionage and we will work to protect our intellectual property.''
At company headquarters, Microsoft spokesman John Pinette would not speculate Friday on who was responsible for the break-in or what their motive might be.
Microsoft is trying to limit and prevent damage to its software, he said.
Pinette said consumer, business and government computers running Microsoft software should be safe.
``We don't believe customers are going to be affected in any way,'' he said.
``Over the long term we will be taking additional steps to protect more securely our corporate assets on our IT (information technology) network,'' Pinette said.
Source codes are the building blocks of computer programs, and Microsoft's codes are the most coveted in the industry. With access to the source codes of Microsoft's operating systems, competitors could easily write programs that challenge the dominance, for example, of the computer giant's Office suite of word processing, spreadsheet and other applications.
The break-in was discovered Wednesday by the software giant's security employees, according to The Wall Street Journal, which first reported the story, citing people familiar with the situation.
Security employees discovered that passwords used to transfer the source code behind Microsoft's software were being sent from the company's computer network in Redmond to an e-mail account in St. Petersburg, Russia, the Journal reported.
The identities of the hackers are unknown. The Journal reported that the hackers are believed to have had access to the software codes for three months, but a source familiar with the case told The Associated Press on Friday it had been going on for at most five weeks.
A person familiar with the break-in told the Journal that it appeared the hackers accessed Microsoft's system by e-mailing software, called QAZ Trojan, to the company's network and then opening a so-called back door through the infected computer.
In hacking terms, a ``trojan'' is quite similar to the Trojan Horse of Greek mythology. It looks like a normal attachment in an e-mail, such as a Word document or picture, but contains a hidden code that can, in effect, take limited control of the recipient's computer.
Once inside, the hacker software can be used to deliver passwords from one computer to another, or even destroy files.
While no motive for the break-in has been mentioned, hackers have in the past tried to extort companies after accessing information from their computers and threatening to publish it on the Internet.
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