We have recently made a switch from MS exchange to Zimbra.
Zimbra Server version: Release 8.0.3_GA_5664.RHEL6_64_20130305090204
OS version: CentOS6_64 FOSS edition
We are using Outlook 2013 email client which synchronizes with the above mentioned Zimbra server using IMAP.
Now Outlook 2013 consumes enormous bandwidth during each send/receive (synchronization) and that too for a long time whereas with exchange server this was not the case.
Any help in order to resolve this issue would be greatly appreciated.