I have client that the same thing was happening. However, no I don't know about the iTunes, maybe they did do an update. Anyway, I renamed the ZD and reinstalled the ZD1 and it came up just fine.
However, I still have to figure out how to get her old emails and docs out of the old directory. Anyone with any ideas how to do that? I have tried copying the store and db directories and that didn't work ......
I have been suffering from this annoying problem for a very long time, and the same problem was experienced even in Zimbra Desktop 2.0 Beta1 (I had uninstalled version 1 first).
Eventually I downgraded back to version 1.0.4 build 1833, and then also downloaded the latest iTunes (I now have iTunes 126.96.36.199), then disabled every option I could find in iTunes about communicating with iPod and tray icon, started Zimbra Desktop again - suddenly everything works!! the Zimbra Desktop toaster/tray-icon appeared! woohoo!
Worth a try for everybody else experiencing the same problem
I lost the ZD battle, and ultimately the $1200 month client. It simple was to unstable for the load they were using it for within their organization. So I conceeded the sale and spent another 120 man hours restoring the MS Exchange system and all 75 PC MS mail apps. Later we put it back under the gizes we had a prototype code we wanted to try. That elevated the harrassing calls for about 30 days, while we got the syning to finally stablize. Ill never offer ZD to any of my clients agian.
They were continuely having issues, with syning and file uploads. The main issue was they had no idea what was happening, ZD would just set there forever, with no indication it was actually uploading the 80 meg files. Trying to do a reset on ZD and resync everyones ZD was simply a nightmare. The back ups are absolutely no good.
So to apply the trayicon workaround (which works for me! ):
Locate the file webapp.ini in your Zimbra installation.
If you installed in the default location on a C: drive, it will be in the folder
"C:\Documents and Settings\[user]\Local Settings\Application Data\Zimbra\zdesktop\zdesktop.webapp"
where [user] is the user's name.
Otherwise, use "Search" on webapp.ini to get there (the older Windows Companion option may work better). Or you could right-click on the app in the Start Bar, select Properties, push "Find Target", then go up two levels to see the parent folder "zdesktop.webapp" listed. Open that to find webapp.ini.
Make a copy of the file, then use a text editor (even Notepad, though it formats it poorly) on the original to change "trayicon=true" to "trayicon=false".
Thank you to the contributors here. (But why a blue multi-? smiley against the most useful line in the thread? I missed it first time!)