This comes up whenever a team decides to retire a Microsoft 365 Group but still needs the historical calendar to stick around somewhere people can reference it. Microsoft 365 Groups do not work like a normal mailbox. There is no simple export button for the group calendar the way there is for an individual Outlook calendar, because a Group calendar is really just a filtered view of the group's shared mailbox rather than its own standalone data object. Here is the practical way to move that history into a SharePoint site that will outlive the group.
The one time export and import approach
If the goal is simply to preserve the existing events as a historical record, the most reliable method is:
- Export the calendar events to Excel, either by copying the data manually from the calendar view or through Outlook's export tools, making sure the start time and end time columns are formatted as genuine Date and Time values rather than text.
- Create a new list on the destination SharePoint site and import that Excel file as its source.
- Once the list exists, create a new Calendar view for it. SharePoint lists support a calendar view out of the box as long as the list has valid start and end date columns.
This gets the events visible on a calendar again, with dates, times, and titles intact. What it will not give you back is full Group Calendar functionality: recurring event handling from the original series, meeting responses, and the tight Outlook and Teams calendar integration do not carry over. This method is best treated as an archive, not a live replacement calendar.
If the group is still active
If you are not retiring the group and instead just want its calendar events to also show up on a SharePoint site on an ongoing basis, a one time export is the wrong tool. A scheduled Power Automate flow using Microsoft's own "Copy Office 365 Group calendar events to a SharePoint list" template keeps a SharePoint list synced with the live calendar automatically, which is a much better fit than repeating a manual export every time something changes.
If you are planning to retire a Microsoft 365 Group and want to make sure nothing important gets lost in the process, that is exactly the kind of migration planning our Microsoft 365 team handles regularly. Get in touch before you decommission anything.