If you want to try new rom for your X500+ , have a look on this post . Its a WM6.1 stripped ROM without some useless M$ stuff and OEM software. Poolsize is is in the ROM modified as well

86.41MB Free storage
24.59MB Free RAM
…sounds pretty good, no?

but be carefull…. IF YOU DON’T UNDERSTAND WHAT YOU’RE DOING ! YOU MAY KILL YOUR DEVICE !