Imap sync broken on Maemo/N900 after update of zimbra server from 6.X to 6.08

[xopotl]

After we updated our zimbra GA server from version 6.0.4 to 6.08, imap sync on Maemo Device (Nokia N900) with pr1.2 and pr1.3 doens't work anymore. With our without using SSL. No new mail is received, even when forcing a send/receive. Nothing was changed on the Nokia Phone and other, non-zimbra accounts still work perfectly with IMAP. I guess something was changed on the imap implementation of Zimbra. Just can't figure out what could cause this problem or what i could do to fix it.

Cfr. Maemo Bug report on https://bugs.maemo.org/show_bug.cgi?id=11428

Any help or suggestions would greatly be appreciated. Thx.