I'm using Zimbra connector v188.8.131.527 with Outlook 2013 x64 in Windows 8. While things seem to sync properly, but the performance of Outlook is horrible. Outlook will stall for 30+ seconds when I click on an email or perform an action like delete. Outlook completely locks up and I can't even use the minimize buttons, let alone anything else in the program. Just curious if future versions of Zimbra connector address these performance issues? I'm happy to provide more information about my setup, if it helps.