Forum Discussion
Question about converting Active M365 Mailbox to Inactive Mailbox, for archiving
The answer to this very much depends on your identity configuration. If you are cloud only, it's pretty simple, when you delete the account you are given the opportunity to convert the mailbox to shared and grant delegate access to the appropriate people. You are also prompted to select a nominated user who will receive access to the OneDrive folder for a period of 30 days before it goes.
If you have hybrid identity and are syncing from your local AD, the process is much different. You delete the AD account, wait for sync, then the O365 account gets moved from Active Users to Deleted Users. If you then choose to restore the account to Active users, it becomes an in-cloud only account. You can then delete it again and it will trigger the process above to convert the mailbox to shared and to nominate someone to access the OneDrive content.