In November of 2006, Microsoft rocked the Linux world by signing a landmark patent and interoperability agreement with Novell. According to the two partners, it's an agreement that today, two and half years later is still paying off, even during the current recession.

On the back of defending the agreement this week, Novell did as promised and published details of its landmark November 2006 Linux partnership agreements with Microsoft.

Over two years ago, Microsoft and Novell signed an interoperability deal. Part of this agreement was a patent deal that suggested that Linux infringed on Microsoft's IP. Since then, Microsoft has signed a number more of these deals with various companies, but the Novell one is still the most famous.

But even Microsoft's childlike "that's mine" attitude about intellectual property and patent violation claims against open source doesn't explain the company's resistance to Red Hat. The question to ask: Whose intellectual property rights is Microsoft seeking to protect?

A global survey of open-source enterprise users of Alfresco software has found that deployments of Red Hat Linux have grown twice as fast as those for Novell SUSE Linux since Novell signed its controversial patent and interoperability agreement with Microsoft in November 2006.

Ina Fried has an interview with "Microsoft's top intellectual property lawyer", Horacio Gutierrez, and Gutierrez directly threatens to sue any company, like Red Hat, that refuses to sell out and do a patent deal like the one Novell signed up for

Even though patent talks between Microsoft and Red Hat broke down last year before Microsoft went on to sign a technical collaboration and patent indemnity deal with Novell, Red Hat is still willing to work with the Redmond software maker on the interoperability front.

New examples of patent trolls and patent boosters (possibly even lobbyists) putting a form of patent tax on the de facto universal platform which is free Myhrvold’s Intellectual Ventures, which is funded and made with Microsoft’s investments (Myhrvold is Microsoft’s former CTO), is expanding the pyramid scheme by signing a patent deal with HTC. The Register says:

Does the Microsoft-HTC patent agreement mean we can expect to see Microsoft weigh in on the Apple vs. HTC patent infringement matter? Or is the Microsoft-HTC deal just one more example (with more mobile-phone makers possibly to come) of Linux companies attempting to head off potential Microsoft lawsuits involving Linux?