Hello!

We are in the process of moving our Mails from Zimbra to OX. When a User is adding his old E-Mail Account information in his OX Webmail Interface he get a sucessful respond message. He can see also the mailbox with the amount of Mails, but he cant read or see any Mails.

I already opened a bug report. I will delete it, as soon I know that is not a bug ;-)
https://bugs.open-xchange.com/show_bug.cgi?id=38664

In the open-xchange.log.0, we got this Error:

t com.openexchange.imap.sort.IMAPSort.sortMessages(I MAPSort.java:342)
at com.openexchange.imap.IMAPMessageStorage.performIM APSearch(IMAPMessageStorage.java:1523)
at com.openexchange.imap.IMAPMessageStorage.searchMes sages(IMAPMessageStorage.java:1481)
... 45 common frames omitted
Caused by: com.sun.mail.iap.BadCommandException: A39 BAD parse error: unknown RETURN option "PARTIAL"
at com.sun.mail.iap.Protocol.handleResult(Protocol.ja va:370)
at com.openexchange.imap.sort.IMAPSort$1.doCommand(IM APSort.java:455)
at com.sun.mail.imap.IMAPFolder.doProtocolCommand(IMA PFolder.java:3659)
at com.sun.mail.imap.IMAPFolder.doCommand(IMAPFolder. java:3609)
... 49 common frames omitted


All Services are up to date.
Zimbra System (Ubuntu 64)
OSX System (UCS)

Steps to Reproduce:
1.create a Zimbra E-Mail Account in the OX Webmail Interface
2.) Try to see the Mail