How do you diagnose appointment notifications?

Question

Hi. Exchange 2016 on-premise. Last CU, Last SU,

Client Office 2016 pro plus, last updates.

A user reports that notifications about appointments are not working correctly. Sometimes they do not come. Sometimes they come at once all emails about meetings that have already passed.

How to diagnose this ? I haven't worked with calendars in Exchange and don't know what troubleshooting methods are available. I want to understand why notifications are not coming or why they are delayed.

Accepted Answer

Hi @Андрей Михалевский,

Welcome to the Microsoft Q&A platform!

Based on your description, you are experiencing an issue with calendar notifications on-premises in Exchange 2016. Let's break down some steps to diagnose and resolve this issue.

Check the user's calendar settings in Outlook to make sure notifications are enabled:

Open Outlook.
Go to File > Options > Calendar.
Make sure the Default Reminders and Show Reminders options are checked.

Test Exchange Web Services (EWS) and Autodiscover using Microsoft Remote Connectivity Analyzer. This can help identify any connectivity issues:

Access Microsoft Remote Connectivity Analyzer.
Run the Exchange ActiveSync and Outlook Autodiscover tests.

Review Event Viewer on the Exchange server for any errors or warnings related to calendar notifications:

Open Event Viewer.
Navigate to Applications and Services Logs > Microsoft > Exchange > Mailbox Assistant.
Look for any related errors or warnings.

Check if the issue persists when using Outlook Web Access (OWA). This can help determine if the issue is specific to the Outlook client:

Log into OWA.
Schedule a test meeting and see if the notification is received correctly.

The Mailbox Assistant is responsible for processing calendar notifications. You can review its logs to find any anomalies:

Navigate to C:\Program Files\Microsoft\Exchange Server\V15\Logging\MailboxAssistants.
Look for logs related to the Calendar Notification Assistant.

Sometimes, corrupted calendar items can cause notification issues. You can scan and repair the calendar using the New-MailboxRepairRequest cmdlet:

New-MailboxRepairRequest -Mailbox  -CorruptionType CalendarFolder

Make sure the time settings of the server and client computers are synchronized. Time differences can cause notification delays.
If the problem persists, try recreating the user's Outlook profile:

Go to Control Panel > Mail > Show Profiles.
Create a new profile and configure it with the user's account.

Please feel free to contact me for any updates. And if this helps, don't forget to mark it as an answer.

Best,

Jake Zhang

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