The simplest method to migrate contents of shared mailboxes is by exporting them as PST files and importing the contents into the new Office 365/ Microsoft 365 tenant.
How to Export Shared Mailboxes to PST?
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We need to create the accounts firstly and then upload the .PST files and map to the users mailbox.
And mainly steps of of importing your organization's PST files list below:
1.Download the PST import tools and key to private Azure Storage location
2.Upload or copy the PST files
3.Create a PST import mapping file
In the CSV file you will find a couple of columns/parameters:
- Workload – For pst import to the user’s mailbox, leave this on Exchange
- FilePath – If you only have pst file in the root folder, then you can leave this empty. If you have used subfolders, then enter here the name of the subfolder.
- Name – If the name of the pst file self
- Mailbox – The mailbox you want to import to
- IsArchive – You can import the pst file to the user’s online archive folder. Set it to true or false.
- TargetRootFolder – If you leave this blank, then the files will be imported to a new folder named Imported in the user’s mailbox. If you want to merge the data with the existing folders (like inbox and sent items) then use only a /
4.Create a PST import job
5.Filter the PST data that will be imported to mailboxes
6.Start the PST import job
Detailed information in official document: Overview of importing your organization's PST files
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