No subject

which resulted in KMail2 showing all my previously read emails as unread.  I'm
told this is because the maildir resource does not read or write the maildir
status in the message filename due to windows compatibility issues (the : in
the filename).  However this means that users on other platforms lose track of
their mail status, and compatibility with other mail clients is lost.  

The support should be copied from KMail1 and ifdef'ed out for Windows only.

The same goes for the filname for new messages itself which I'm told is
currently not standards compliant and breaks compatibility with other mail
apps.

Reproducible: Didn't try

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