I'm trying to switch my account settings from POP3 to IMAP, because I started to use my e-mail account on my smartphone and I want to know which messages I've already read.
The problem is I can't do it, because every option in server protocol settings is grayed out.
Is doing so impossible due to some inner workings or settings differences of POP3/IMAP?
I don't want to create new account in Sylpheed - I've got lots of filters and local folders, that I'd like to have and creating 'em all over again would be too time consuming.