Running version 10.4.5326 (97a2e75), since the most recent upgrade I am now getting the following error [AirSync] Synchronizing folder ‘*************@outlook.com/Calendar’ failed due to the following error: The input string ‘’ was not in a correct format.

Outlook Calendar Sync Fails

Kim_Fisher April 15, 2026, 12:49pm 3

Sync error repeating with calendar for MSN account Calendar

Thanks to everyone who brought the issue to our attention. I can now confirm our developers were able to identify the cause and prepare a fix, so I’ll email everyone affected an internal version for download once it’s ready.

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