Hi friends...

I have a problem here that it's really piss me off.....

We have a Zimbra Server (Open Edition) 7.2.1 that was virtualized with VMWare ESXi.
We have installed a Virtual Machine and have installed Zimbra on a x64 CentOS 6.x.
We also have a dedicated internet link with 2 MB.
We have around 300 users here...
We notice that IMAP has a really poor performance and Outlook really get slow, but very slow connection indeed...
Many of users complain about it after we change Pure Postfix solution to Zimbra...
Is there some background regard this problem?

Someone also has take this problem and how solved it??

Thanks