I had no problem with Zimbra and liked it.
The problems started after I istalled AVAST.When I clicked on ZIMBRA desktop icon, I get an error message:

javascript Application
"Couldn't access Yahoo! Zimbra Desktop server. If issue persists after reinstall, please check logs for errors and report to http://www.zimbra.com/forums/zimbra-desktop."
Now I cannot get all my past emails and contacts at all.
I tried restalling the same version of Zimbra but get same error.
Can anyone help . How do I get my past emails and contacts!