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Mobile e-mail technology vendor Visto Thursday claimed that Microsoft's Windows Mobile 5.0 platform violates its patents and has signed a licensing agreement with NTP, which has sued Research In Motion for alleged patent violations.
In addition, NTP has acquired an equity stake in Visto, the company said in a statement.
Visto said in a statement that it has filed a patent infringement lawsuit against Microsoft in U.S. District Court in Texas that covers three specific patents owned by Visto. The complaint asks the court to prohibit Microsoft from improperly using Visto's intellectual property and asks for compensation.
Visto is among the vendors offering mobile e-mail service via cellular operators. Among those operators are Cingular, Sprint Nextel and Canada's Rogers Wireless.
Visto said in a strongly-worded statement that its co-founder, Daniel Mendez was among those who developed and patented a system to enable mobile users to receive e-mail delivered to servers behind corporate firewalls. Microsoft touted Windows Mobile 5.0, which it released last summer, as being able to connect directly to Microsoft Exchange Server so that device users have direct access to their e-mail and other personal information.
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