Birthday isn't correctly synced to iOS native mail app in Exchange Server 2019 and 2016

Symptoms

In Microsoft Exchange Server 2019 or Exchange Server 2016, you create a contact with a birthday by using the Outlook for Windows client. The time zone of the Outlook client is CET. When the contact is synced to an iOS native mail app, the contact shows birthday one day before the day entered in Outlook. iOS has a birthday calendar where a recurring appointment is created with the wrong date.

Resolution

To fix this issue, install one of the following updates:

For Exchange Server 2019, install the Cumulative Update 5 for Exchange Server 2019 or a later cumulative update for Exchange Server 2019.​

For Exchange Server 2016, install the Cumulative Update 16 for Exchange Server 2016 or a later cumulative update for Exchange Server 2016.


Notes

It's technically not possible to do changes for already created birthdays after you apply this update. However, there are two workarounds available: ​

  • Update the contact information. This will provide the correct birthday together with this update.​

  • Users can clean the birthday calendar and add the birthdays again.

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.

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