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Symptoms
When you receive a Google Calendar event invitation in Outlook, the Reminder setting in the Outlook meeting displays None.
Cause
The sender of the Google Calendar event used the default notification time. In this scenario, Google Calendar doesn't add an event reminder in the ICS file that's attached to the invitation email.
Outlook adds the event to your calendar based on the information in the ICS file.
Note
Although the Google Calendar default notification time is typically 30 minutes, the issue occurs for any default notification time. The issue also occurs if there are multiple default notification times.
Workaround
In the following examples, Google Calendar successfully adds a reminder. Google Calendar users can use these techniques to add a reminder to external invitations.
The default Google Calendar event notification time is 30 minutes but a Google Calendar user manually changes the notification time to 25 minutes. The Google Calendar invitation will contain a 25–minute reminder entry in the ICS file. When Outlook adds the event to your calendar, the new meeting will have a 25–minute reminder.
A Google Calendar user keeps the default event notification time but manually adds another notification with a different time. The Google Calendar invitation will contain both reminder times in the ICS file. When Outlook adds the event to your calendar, the new meeting will use the shorter of the two reminder times.
If a reminder isn't set in a Google Calendar invitation that you receive in Outlook, you can set a reminder manually in Outlook.
More information
To check for an event reminder in an invitation ICS file, open the ICS file in a text editor and look for a VALARM entry. Google Calendar event invitations that have no reminder have no ICS VALARM entry. The following example VALARM entry specifies a 30–minute reminder:
BEGIN:VALARM
ACTION:DISPLAY
DESCRIPTION:This is an event reminder
TRIGGER:-P0DT0H30M0S
END:VALARM