Our friends at Macnn, recently spoke to Filemaker about compatibility with Lion. Their response ?
“FileMaker Pro 8.5 or greater will install on Lion.”
BUT
“Only FileMaker Pro 11.0 will be certified and supported to run on Lion.”
So, the bottom line is, you can use any version from 8.5 and up, but you might have some minfor problems. They only support Filemaker Pro 11.