Last Updated: March 22, 2019
Outlook 2016 connected to Microsoft 365 does not show all content of a calendar folder opened in cached mode. The issue reproduces in every new Outlook profile created and the calendar cannot be synchronized in cached mode. The Synchronization Tab of the calendar folder shows not all items have been synchronized.
The synchronization logs in the Sync Issues folder show the following error:
Sync Error [80070057-30FFFFFF-0-560]
STATUS: SERVICE FIX
A service side fix has been deployed. The fixed Version is 15.20.1687.000 or higher.
After the first fix we found another variant of the same issue affecting attachments and that fix is being deployed. The fixed version is 15.20.1772.000 or higher.
Note: The service version can be seen using the Outlook Connection Status dialog discussed in this article: Description of the Connection Status dialog in Outlook.
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