Your customer also need to upgrade because before i am using Filemaker Pro 11 and that time i just try Filemaker Pro 12 Trial version.
i can able access the Filemaker Pro 11 database in Filemaker Pro 12 Advance but in Filemaker Pro Advance database File Cann't Access in Filemaker Pro 11
FileMaker 12 uses a new file format not used by earlier versions. If you open a file created with an earlier version, FileMaker produces a copy of the file converted to the new format. Older versions cannot open this new format and there is no way to run the conversion in reverse to convert a Filemaker 12 file into the .fp7 format used in FIlemaker 7 through 11.
Thanks, that's what I needed to know.