Don't map imaps to 993 anymore except on old Windows versions
'open-network-stream' will do the imaps service lookup itself, and using 993 forced the user to use the numeric value in .authinfo for certificate lookups. * lisp/gnus/nnimap.el (nnimap-map-port): Only do mapping for Windows XP or earlier. * etc/NEWS: Describe imaps mapping change.
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