I should think it obvious that they are different versions of the
protocol. IMAPv4 has features that IMAPv2 does not, however, IMAPv4 has
all the commands that IMAPv2 supports as well, making it such that an
IMAPv2 client can connect to an IMAPv4rev1 server and work merrily with
blissful ignorance.

However, an IMAPv4 client connecting to an IMAPv2 server will not
necessarily work because it may try to use features from IMAPv4 that are
not present in IMAPv2.

It's like... why can't Microsoft Word 95 open and read Microsoft Word
2000 files? :)

Jeff

On Tue, 2004-10-19 at 03:21, Ow Mun Heng wrote:
> On Tue, 2004-10-19 at 02:11, Jeffrey Stedfast wrote:
> > fwiw, Mandrake's /etc/services file has it the Right Way (tm). imap2
> > should be an alias to imap, not the other way around :)
> > 
> > you can connect an imap2 client to an imap4 server, but you can't
> > connect an imap4 client to an imap2 server.
> 
> May I ask what's the difference?
> 
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