Updated at 3:30 p.m. PDT with additional detail and to correct the filing date for TomTom's suit, which was Monday.
TomTom has responded to Microsoft's patent suit by filing a patent claim of its own against the software maker.
The GPS device maker, based in The Netherlands, filed the countersuit in the U.S. District Court for the Eastern District of Virginia on Monday. TomTom says Microsoft's Streets and Trips products infringe on four patents it owns related to vehicle navigation software.
In a statement, Microsoft lawyer Horacio Gutierrez said the company is still in … Read more