Terms of the deal weren’t revealed, but it was likely to be fairly small, especially given that this is not a complete acquisition of the company. Since its founding two years ago, Palo Alto-based Threadbox has raised $2 million in funding.

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Unlike most social chat tools, Threadbox is mainly focused on making e-mail as a real-time messaging experience. Like an instant message box, Threadbox shows users who among their list of friends is available online, and lets you post and receive messages, files, images. Not that different from what most instant message services do, but the e-mail aspect is a bit novel.

MySpace has been struggling for some time and it’s not clear how big a deal the addition of Threadbox’s assets will be. Threadbox claims it has 60,000 users spread out among 20,000 businesses, which could provide at least an incremental revenue boost, something MySpace would like to have. This is the company’s first acquisition since MySpace co-president Jason Hirschhorn resigned his post last month.