Actually, I don't get to the three red icons screen -- it hangs at the start on a white screen with a circle of dots in the center, dots being grey but for a rotation of a dot being red.
Thanks for the Shift-F6, a flurry of messages came up. Here are the messages that look like they may be relevant, after some information stuff about 'can update':
Reading Status File: C:\Documents and Settings\amyp\Local Settings\Application Data\Zimbra\Zimbra Desktop\Zimbra\Zimbra Desktop\win32\prism\updates\0\update.status
_postUpdateProcessing: No Status, No Update
_loadXMLFileIntoArray: XML File does not exist
Error: this.docShell is null
Source File: chrome://global/content/bindings/browser.xml
Line: 0
Warning: Error in parsing value for 'height'. Declaration dropped.
Source File: file:///C:/Documents%20and%20Settings/amyp/Local%20Settings/Application%20Data/Zimbra/Zimbra%20Desktop/zdesktop.webapp/splash.html
Line: 8
Error: uncaught exception: [Exception... "Component returned failure code: 0x80540006 [nsIApplicationIcon.show]" nsresult: "0x80540006 (<unknown>)" location: "
JS frame :: chrome://webrunner/content/webrunner.
js :: anonymous :: line 740" data: no]