joabj writes "In what may be its first investment in an open source software company, Microsoft has quietly invested in TurboHercules, which maintains the Hercules open source IBM mainframe emulator. Perhaps the potential for purloining customers from the juicy mainframe market outstrips any misgivings Microsoft may have about open source. You might remember TurboHercules: In March, it filed an antitrust complaint with the EU over IBM's tying of its mainframe OSes with its hardware." A story from earlier this year gives more information on the related conflict between Hercules and IBM over patents.
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