Migrating calendars along with your mailboxes can sometimes cause issues, particularly with respect to calendar appointments, so it’s important to understand the pitfalls. Follow the links below for more information.
- The primary calendar of the user is mapped to the calendar system folder of the Destination.
- Migration of all properties with the following exceptions:
- Migration of up to one alert (because Exchange has only one alert). Note: This refers to the fact that Google can have several calendar alerts/reminders, but Exchange can have only one. This means that in Google you can have a calendar reminder set to remind you hourly, daily, and even weekly. On Exchange, you can have only one alert (e.g., every hour).
- Calendar permissions are not migrated.
G Suite supports calendar sharing. For each mailbox, we only migrate calendars owned by the user (i.e., not calendars owned by other users). In most cases, conference room calendars will not be migrated.
There is an old known issue where calendar events cannot be updated post-migration. The actual origin of the issue is unknown. Follow the link above for more information, as well as Microsoft resources.
Duplicate calendar items can be created when the Source is G Suite, and the resource or location of calendar items is changed while a migration is occurring.