RFC2047 message header fields

Does Lotus Notes support RFC2047 fully?

When header field looks like =?utf7?B?blah-blah-blah?= it appears as it is - not decoded variant, though Outlook and gmail do it corrrectly.

Same time when sent like =?iso-8859-1?Q?blah-blah-blah?=

If problem exists please tell which versions are free of it?