[imp] imap_utf7 calls and Exchange server

[Metee Khanongnuch]

>(Exchange Server) it appears that the imap_utf7 may be broken.  I've also
>found that UW-imapd does not bother at all with UTF7.  We have strange
>names all over our server:
>
>M&60-moire
>&AMk-l&AOk-ments envoy&AOk-s
>etc...
>
>The last one correspond to "ษl้ments envoy้s" in modified UTF-7 according
>to Exchange.
>If the folder is created with IMP 3.0 the name is:
>
>&yQ-l&6Q-ments envoy&6Q-s
>
>Why the difference?

folder name of Microsoft use UNICODE table not ASCII table
so, when it converted to UTF7 it difference from folder name that use ASCII
table.

&AMk-l&AOk-ments envoy&AOk-s   <-- The folder name from UNICODE table
&yQ-l&6Q-ments envoy&6Q-s     <-- and this folder name from ASCII table

>Since UW-imapd doesn't use UTF7, i'd like to know the context in which the
>imap_utf7_* calls have been added to IMP.  For which servers? It certainly
>don't look it works with the Microsoft one.