San Francisco: Microsoft Corp has sued the US government for the right to tell its customers when a federal agency is looking at their emails, the latest in a series of clashes over privacy between the technology industry and Washington.


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The lawsuit, filed on Wednesday in federal court in the Western District of Washington, argues that the government is violating the US Constitution by preventing Microsoft from notifying thousands of customers about government requests for their emails and other documents.


The US Department of Justice did not immediately respond to a request to comment.


The government’s actions contravene the Fourth Amendment, which establishes the right for people and businesses to know if the government searches or seizes their property, the suit argues, and the First Amendment right to free speech.


Microsoft’s suit focuses on the storage of data on remote servers, rather than locally on people`s computers, which Microsoft says has provided a new opening for the government to access electronic data. 


Using the Electronic Communications Privacy Act, the government is increasingly directing investigations at the parties that store data in the so-called cloud, Microsoft says. The 30-year-old law has long drawn scrutiny from technology companies and privacy advocates who say it was written before the rise of the commercial Internet and is therefore outdated.


“People do not give up their rights when they move their private information from physical storage to the cloud,” Microsoft says in the lawsuit, a copy of which was seen by Reuters. It adds that the government “has exploited the transition to cloud computing as a means of expanding its power to conduct secret investigations.”


The lawsuit represents the newest front in the battle between technology companies and the US government over how much private businesses should assist government surveillance. 


By filing the suit, Microsoft is taking a more prominent role in that battle, dominated by Apple Inc in recent months due to the government’s efforts to get the company to write software to unlock an iPhone used by one of the shooters in a December massacre in San Bernardino, California. Apple, backed by big technology companies including Microsoft, had complained that cooperating would turn businesses into arms of the state.


In its complaint, Microsoft says over the past 18 months it has received 5,624 legal orders under the ECPA, of which 2,576 prevented Microsoft from disclosing that the government is seeking customer data through warrants, subpoenas and other requests. Most of the ECPA requests apply to individuals, not companies, and provide no fixed end date to the secrecy provision, Microsoft said.


Microsoft and other companies won the right two years ago to disclose the number of government demands for data they receive. This case goes farther, requesting that it be allowed to notify individual businesses and people that the government is seeking information about them.


Increasingly, US companies are under pressure to prove they are helping protect consumer privacy. The campaign gained momentum in the wake of revelations by former government contractor Edward Snowden in 2013 that the government routinely conducted extensive phone and Internet surveillance to a much greater degree than believed.


Microsoft’s lawsuit comes a day after a US congressional panel voted unanimously to advance a package of reforms to the ECPA.


Last-minute changes to the legislation removed an obligation for the government to notify a targeted user whose communications are being sought. Instead, the bill would require disclosure of a warrant only to a service provider, which retains the right to voluntarily notify users, unless a court grants a gag order.


Republican leadership said it will bring the bill to a full vote in the House of Representatives in two weeks. After its expected passage, the bill will await Senate consideration.


Separately, Microsoft is fighting a US government warrant to turn over data held in a server in Ireland, which the government argues is lawful under another part of the ECPA. Microsoft argues the government needs to go through a procedure outlined in a legal assistance treaty between the US and Ireland.