There's more at
http://news.zdnet.co.uk/story/0,,t269-s2138028,00.html , but it mostly covers the same ground. One snippet it provided of which I was unaware is that HTC makes O2's XDA too. (I knew they made Ipaq's) HTC aren't exactly famous as handset designers, and handset design is a dark art with few practitioners worldwide. So, who designed the XDA?
If I was being paid big bucks as Sendo's lawyer, I'd quietly tell a gopher to run down to the local Phones4U, and come back with a couple of XDA's - to let the engineering guys run a rheumy eye over. Who knows what they might find... If HTC is the culprit in the Sendo IP affair and not Microsoft, might they not save some cash by re-inventing the wheel as little as possible? If you've got a design that works (and is safely hidden inside the case) why not recycle it?
Given the case of Stacker vs. Microsoft (settled out of court for $120m if I recall correctly) this wouldn't be the first time Redmond has been caught peddling someone else's IP, after the other half of a joint development went sour on the deal. I think the "corporate culture" within MS makes this kind of thing almost inevitable.