Adobe has ambitious plans for Flash Player 10.1 on smartphones. Back in October, the company detailed its effort to get the new Flash Player on as many smartphones as possible in 2010 — except the iPhone, of course. Now according to IntoMobile, it looks like Windows Mobile 6.5 is going to be left out in the cold as well, in favor of the recently announced Windows Phone 7 Series.

According to an Adobe representative, Windows Mobile 6.5 doesn’t support some of the “critical APIs” that the company needs for Flash support. We’ve emailed Adobe for further details, and will report back once we’ve heard something.

Adobe’s reasoning seems plausible enough, but I have a hard time believing that it just conveniently discovered this API deficiency so soon after 7 Series’ announcement. It’s far more likely that Adobe realized it’s just not worth supporting WinMo 6.5. That would put it in good company — Skype just recently announced that it is dropping support for Windows Mobile as well, along with Skype Lite. I’d venture that many developers can’t wait to jump off of Windows Mobile 6.5 — an operating system which has gained notoriety for its archaic interface —  in light of Microsoft’s upcoming mobile OS.

Flash Player 10.1 will be the first full version of the software available for mobile platforms. Previously, Adobe has offered Flash Lite, a stripped down version of the software. 10.1 will also be the first version of Flash to recognize touchscreens and accelerometers, and Adobe promises improved performance and battery life. It’s scheduled to be available for the public in the first half of 2010 across most major smartphone platforms — including Blackberry, Palm’s Web OS, Android, and Symbian.

If Adobe is successful with Flash Player 10.1, it’s likely that Apple will have to rethink it’s position on Flash.