yeah
it is great , i tested it,,,,,
i love zimbra.
only problem so far is the bad speed,,maybe because it is java.
ok... but it is in beta so what.
yahoo has to use zimbra to defends its leading position in mail service ,,,,then gmail has no chance....
in my opinion zimbra is better than gmail and thunderbird.
and now you can use your free yahoo account trough imap with zimbra,
isnt it great?
unfortunately it is at moment only with yahoo.com mail adresses possible to use, not with local one like yahoo.de