I just upgraded to iTunes 12.3.1.23 64-bit on Windows10. Since the upgrade iTunes get stuck on Syncing contacts, both on iPhone & iPad, both on IOS 9.0.2 and IOS 9.1
Darn annoying when everything was working on the previous version of iTunes 64-bit on Windows10 😠
Has anyone else experienced the same problem?
Any tips on fixing the issue?
11/30/17 - I'm on 64-bit Windows 10 and was having the same problem syncing. The phone (iPhone 6 SE ios 11.1.2) would back up and then hang at step 3 of 5 , "preparing to sync". I was trying to sync with Outlook 2016 using iTunes 12.7.1.14 but it just wouldn't complete the sync. I tried reinstalling iTunes after doing the recommended uninstall process then doing a clean install of iTunes. It would sync one or two times then revert to hanging at the "preparing to sync" stage. I tried the reboot of both my PC and the iPhone all to no avail. . . . . One of the other post suggesting launching iTunes using a right-click to "Run as Administrator". Bingo, that did the trick . . . . at least until Apple or Microsoft do some other silly update that begins the sync problem all over again.
11/30/17 - I'm on 64-bit Windows 10 and was having the same problem syncing. The phone (iPhone 6 SE ios 11.1.2) would back up and then hang at step 3 of 5 , "preparing to sync". I was trying to sync with Outlook 2016 using iTunes 12.7.1.14 but it just wouldn't complete the sync. I tried reinstalling iTunes after doing the recommended uninstall process then doing a clean install of iTunes. It would sync one or two times then revert to hanging at the "preparing to sync" stage. I tried the reboot of both my PC and the iPhone all to no avail. . . . . One of the other post suggesting launching iTunes using a right-click to "Run as Administrator". Bingo, that did the trick . . . . at least until Apple or Microsoft do some other silly update that begins the sync problem all over again.
Same symptom when bypassing contacts, it then gets stuck on Syncing calendars.
Running Office Professional Plus 2013...........
Same symptom when bypassing calendars, it then gets stuck on Syncing bookmarks.
When bypassing contacts, calendars and bookmarks it goes through.
At least my Photos, Apps and Music syncs.
This issue is being reported in at least two other forum threads. I have not seen a solution, yet.
Itunes stucks at "Preparing to sync"
iTunes 12.3 stuck at preparing to sync when using USB to sync with iphone 6 ios 9.1
iTunes 12.3.1.23 64-bit Win10 stuck on sync iPhone & iPad
