Hi @GoodResource ,
You could try to export the calendar using the following cmdlet:
Export-Mailbox-Identity –StartDate ‘01/01/2016’ –EndDate ‘31/12/2019’ –IncludeFolders ‘\Calendar’ –FilePath \\PSTFile\FolderName\FileName.pst
Refer to:
https://www.nucleustechnologies.com/blog/export-import-calendar-items-from-office-365-using-powershell/
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