I'm looking for some simple tagging software which can
- edit (or at least import from) existing exif (for images) or pdf tags
- search for tags
- handle at least jpg / pdf / office documents
- tags should be shareable : if I copy a directory with all the tagged files to a remote server or an usb key, tags should still be there
The question What's good tagging software for Windows Explorer? does not help me as it's not about exif, nor does it allow me to share tags across computers.