Over the last couple of months, there have been many rumors flying around regarding Xbox Live and its potential availability on Windows branded mobile devices. Earlier, internal Microsoft marketing material was obtained, showing that the popular online gaming service will be coming to Microsoft's Windows Mobile platform (hopefully) soon.
Recently, Xbox Live for Windows Mobile was hinted at through a Microsoft job posting; sufficient evidence in itself, though of course, nothing's official until the company says it's official. Earlier, Kotaku reported that the aforementioned marketing material had been unveiled, which does indeed show "Windows phone" under the list of Xbox Live compatible devices; as the website mentioned though, it's certainly rather puzzling. As you'll see from the attached image below, there are no mentions of Zune (a device that Microsoft would most likely want to have included in the service) or anything else other than "Windows phone."
Keep in mind that Microsoft itself hasn't confirmed nor denied this, though the proof is pretty undeniable. Hopefully the Redmond-based software giant will publicly respond soon, detailing its plans for an Xbox Live & Windows Mobile partnership.
Image courtesy of Kotaku. (Full size.)