Windows 10 64-bit, but using 32-bit Claws Mail. I have several Linux boxes that dump the output of cron jobs into a single, shared mbox file. If I create a Local mbox file account, Claws on Linux happily reads the file, filters the messages, and deletes them from the mbox file. However, Claws on Windows, with the exact same settings and the same file does not import the messages. Clicking Get Mail runs without errors, but no messages appear in the client and the mbox file remains intact. I've tried manually importing the file via File | Import mbox file and that works fine, so it doesn't seem to be a general problem with mbox files. But using that as a workaround and manually applying filters sort of spoils the utility of the feature.