Allowable trademark usage

[jabbathehut]

I have developed a software add on which works well with another company's product.  The software doesn't modify or use their software, nothing like that.  I want to market and sell this product directly to customers who might own said software.  The company's name and product are registered US trademarks.

How can I advertise and label my product in such a way to let people know that it works with the trademarked company name and product?  I don't want to pay a licensing fee if I don't have to.  Thanks.

[JSonnabend]

As a general answer, you should be able to say "works with [insert trademarked software name here]".  That doesn't mean the owner of that other trademark won't get mad or even try to stop your use, but such use should be excused as nominative.

- Jeff