Windows Phone 7
A new non-Windows name would have let Microsoft use a 1.0 version number. I think the “7” in “Windows Phone 7 Series” is a detriment to their message that this is a clean break from Windows Mobile 6 and earlier. The 7 implies “new version of the old thing”, which isn’t what they want at all because the old thing is unloved and unpopular. A new 1.0 thing would have also dampened uncomfortable questions about why phones available today won’t be upgradeable to the new system when it ships.
