I'm using the USB version of 1.25 now. I'm using a PC now and everything is fine.
I'm thinking of switching to the MAC. Can I still use KeePass on my USB stick? The OS version on the USB stick is FAT so MAC can still read it.
KeePass 1.x is a windows program and does not run on Mac OS X. There a couple of 3rd party ports (KeePassX & KyPass companion) that read and edit 1.x database files on Max OS X. Links to them are available on the download page.