When iTunes 9 is installed Zimbra gets stuck. In Error console there are 2 errors:
Error: this.docShell is null
Source File: chrome://global/content/bindings/browser.xml
Line: 0
Error: uncaught exception: [Exception... "Component returned failure code: 0x80540006 [nsIApplicationIcon.show]" nsresult: "0x80540006 (<unknown>)" location: "
JS frame :: chrome://webrunner/content/webrunner.
js :: anonymous :: line 687" data: no]