Symptoms
In Microsoft Exchange Server 2019 or Exchange Server 2016, you can't upload an .ics file that's formatted by Apple in Outlook on the web (formerly known as Outlook Web App).
Resolution
To fix this issue, install one of the following updates:
For Exchange Server 2019, install the Cumulative Update 4 for Exchange Server 2019 or a later cumulative update for Exchange Server 2019.
For Exchange Server 2016, install the Cumulative Update 15 for Exchange Server 2016 or a later cumulative update for Exchange Server 2016.
Third-party information disclaimer
The third-party products that this article discusses are manufactured by companies that are independent of Microsoft. Microsoft makes no warranty, implied or otherwise, about the performance or reliability of these products.
References
Learn about the terminology that Microsoft uses to describe software updates.
