Symptoms
Assume that a cross-forest meeting is updated between organizations. However, the attendees see the time of the meeting as having changed and have to accept the meeting again. This issue occurs regardless of what is changed on the meeting and exists in both Microsoft Exchange Server 2016 and Exchange Server 2013.
This issue also affects third-party applications that send meetings through the iCalendar standard.
Cause
This issue happens because of the duration property isn't correctly handled during the iCalendar conversation.
Resolution
To fix this issue, install one of the following updates:
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For Exchange Server 2016, install Cumulative Update 9 or a later cumulative update for Exchange Server 2016.
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For Exchange Server 2013, install Cumulative Update 20 or a later cumulative update for Exchange Server 2013.
Status
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
References
Learn about the terminology that Microsoft uses to describe software updates.
