iCloud 15 not syncing Calendars and Contacts to Outlook

Here we go again. Similar to the problem under iCloud 14, trying to sync Calendars and Contacts to Microsoft Outlook 2021 on a Windows 11 machine gives an "iCloud for Windows Installation Error". A dalog pops up saying


"iCloud for Windows did not install properly. To repair it, you need to go to Apps and fetures, select iCloud Outlook from the app list and click Modify. When prompted, click on Repair."


As with iCloud 14, this does absolutely nothing to fix the problem. (A user on a Microsoft forum had found missing registry entries under iCloud 14, but they don't appear to work here. The other suggestion is to use iCloud 7.2, but that's designed for Windows 7 and 8. According to that forum post, the problem went away on September 23 thanks to an apparent update to iCloud 14 that was never noted in a changelog. But now it's here again.


The iCloud plugin is active in Outlook and the iCloud control panel reports that syncing is "on" with a green light. There are no contacts or calendar appointments, which have no problem syncing to my iPad or iPhone.

Windows, Windows 10

Posted on Feb 10, 2024 12:58 PM

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Posted on Feb 10, 2024 2:50 PM

I went to reddit about 3 weeks ago and downloaded the legacy app which is 7….sorry if you don’t find it I will find the exact version. I deleted everything on my windows 11 pc, restarted computer and emptied recycle items. I then installed the 7….ver and opened iCloud app on desktop and selected to use ms outlook for contacts and calendar. Your iCloud C &C will merge with no issues. Opened outlook 365 and checked to insure iCloud add on was enabled, then went to calendar list on side panel and selected the iCloud calendar and removed check by all others. Lasts step done same as the calendar but now for contacts. It Worked!! I also checked default apps to see that the correct mail contacts and calendar were correct. Good luck hope it works for you I am just a user not an expert but I spent many days solving for myself.

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Question marked as Top-ranking reply

Feb 10, 2024 2:50 PM in response to Shockmaindave

I went to reddit about 3 weeks ago and downloaded the legacy app which is 7….sorry if you don’t find it I will find the exact version. I deleted everything on my windows 11 pc, restarted computer and emptied recycle items. I then installed the 7….ver and opened iCloud app on desktop and selected to use ms outlook for contacts and calendar. Your iCloud C &C will merge with no issues. Opened outlook 365 and checked to insure iCloud add on was enabled, then went to calendar list on side panel and selected the iCloud calendar and removed check by all others. Lasts step done same as the calendar but now for contacts. It Worked!! I also checked default apps to see that the correct mail contacts and calendar were correct. Good luck hope it works for you I am just a user not an expert but I spent many days solving for myself.

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iCloud 15 not syncing Calendars and Contacts to Outlook

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