Citation needed. This has never occurred to me.
> And when the thread is spread across many folders, there needs to be a way to see the whole thread.
Already possible, at least in Thunderbird.
> Labels are a fundamental feature [...] and neither IMAP nor POP can handle them gracefully.
IMAP has user-defined labels, whats wrong with them?
An underrated feature of IMAP is that you can attach notes to mails.
Citation needed. This has never occurred to me.
> And when the thread is spread across many folders, there needs to be a way to see the whole thread.
Already possible, at least in Thunderbird.
> Labels are a fundamental feature [...] and neither IMAP nor POP can handle them gracefully.
IMAP has user-defined labels, whats wrong with them?
An underrated feature of IMAP is that you can attach notes to mails.