What's it about Windows Mobiles and Windows Phones?

I have my father's old HTC Touch Pro 2 and so am I right it's a Windows Mobile and not a Windows Phone? And when I search from the web for Windows Mobile apps and games all I can get is Windows Phone stuff. But I can't use it, right? So... I've heard they made a change and so but I can't find any apps so what to do? Should I just throw it away, like is it off the market etc? Or are there still some good places where I could download apps and stuff? If there are could someone suggest me some? Or is it some thing with updates and I have to update something? Sorry, so many weird questions but I really like this phone and want it to work nicely with apps and so, so could somebody just clear this stuff a little for me? All answers are welcome! :)