This might be an extremely dumb question, but I've just clean installed Panther, copied my Mail folder from Jaguar back into ~/Library and now some of my mail folders in the drawer in Mail are silver/grey (but some aren't). It's not because an account is offline, as I checked (and the mailbox names are still black text), it's just some of my folders.
I'm not a newb to X, but I can't seem to find a reason for this. Can anyone enlighten me? TIA.