In a case closely watched by the tech sector, Microsoft will challenge Thursday a US court order requiring it to give prosecutors electronic mail content associated with an overseas server. Microsoft said it plans to argue that the warrant, which would require the tech giant to turn over customer emails stored in a data center in Dublin, should be nullified because it would give the US government excessive power to pry over private information. The case comes amid rising concern about US surveillance following revelations of snooping disclosed by former National Security Agency contractor Edward Snowden. Leading tech firms, including Apple and Verizon, have filed briefs supporting Microsoft.