The guys behind ChevronWP7, the first Windows Phone 7 jailbreaking tool, are in Redmond to meet with Microsoft about opening the new mobile operating system to third-party applications.

And all they got, developer Long Zheng joked on his blog, was a lousy T-shirt.

“In our first meeting with Brandon Watson and members of the Windows Phone 7 team about homebrew on the WP7 platform on-campus at Redmond,” he wrote, “we received a ‘I was the first to jailbreak Windows Phone 7, and all I got was this lousy T-shirt.’ Our meeting is now complete. Just kidding.”

There’s not much more to report here, other than that Microsoft and the ChevronWP7 guys — Zheng, Rafael Rivera and Chris Walsh — are following through. We’ll see what the groups come up with regarding homebrew openness.

Here’s what the ChevronWP7 developers had to say Dec. 1, when they pulled the tool:

Through this discussion, we established a mutual understanding of our intent to enable homebrew opportunities and to open the Windows Phone 7 platform for broader access to developers and users.

To pursue these goals with Microsoft’s support, Brandon Watson has agreed to engage in futher (sic) discussions with us about officially facilitating homebrew development on WP7. To fast-track discussions, we are discontinuing the unlocking tool effective immediately.

We are excited to explore the opportunity to become more involved with the shaping of the platform and to build a feedback channel for developers around the world