G.ho.st, a startup that offers a hosted operating system, has accused Microsoft of violating a company trademark with its prominent use of the phrase “no walls” in its recently unveiled $300 million Windows marketing and advertising campaign.

A letter from G.ho.st CEO Zvi Schreiber sent to Microsoft CEO Steve Ballmer last Tuesday asked the company to stop using the phrases “life without walls,” “imagine without walls” and “imagine no walls” on its products, Web site, marketing materials, advertising and other promotions and agree in writing to stop using these phrases by the close of business last Thursday.

As of Monday, Microsoft was still using the phrases in its campaign. Microsoft spokesman Michael Marinello said via e-mail Monday that the company acknowledged it had received Schreiber’s letter but “the allegation is without merit.”

Source:→ Macworld