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Thanks for your post. Yes, we can use PST file to do that. You can take a look the following steps:
1, export all the calendar information as a PST file
2, remove the user mailbox and create the new room/resource mailbox
3,connect Exchange online via Powershell help.outlook.com/.../cc952755.aspx
4, setup the permission on the room mailbox Add-MailboxPermission -Identity <room-mailbox> -User <user> -AccessRights fullaccess
5, use autodiscover service and mapping the mailbox which you have permission (Outlook client)
6, import the pst file via Outlook client
Thanks, Neo Zhu
We can use PowerShell to switch a user mailbox to a room mailbox. But in this case, it's not a good solution. For Exchange online ,one user mailbox need an Exchange online license, but room mailbox doesn't.
For this case, once we switch the type of mailbox from user to room, and remove the license of that room mailbox. The service will remove the whole mailbox ( can't recovery).
Thanks, Neo Zhu,
Good to know. I found another answer to this issue as well. Apparently there is a Powershell command that will allow a User Mailbox to be converted to a Room Mailbox. This method seems to be the best solution in our case as it retains the existing setup of the calendar and the reservations that have been made already. The powershell command the was shared is:
Set-Mailbox "user" -Type room
How are you doing? I am just writing to see if there is any progress on this issue. I do not mean to push you. I just want to ensure that you do not encounter any problems during the troubleshooting. Thank you.
Thank you, Neo.
We are all set to go wtih this. We have our resource mailboxes setup and all entries are still there.