Many thanks for all your support in my previous problems with device activation. These problems were fixed after i've replaced Outlook 2007 with Outlook 2003. Device now activate without any issues.
However, there is another issue, which is Calendar sync. The sync only works one way - from Zimbra server to the device. However, if I create a new calendar entry on the device, it is not being copied to the Zimbra server.
I am using 5.0.18 server and BES connector with Outlook 2003 with latest patches.
Did anyone experience similar issues? is there a workaround?