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Delete and re-create the default discovery mailbox in Exchange 2013

In Exchange Server 2013, the maximum size of the default discovery mailbox is 50 GB. It’s used to store In-Place eDiscovery search results. Before the size limit was changed, organizations could increase the storage quota to more than 50 GB. As a result, discovery mailboxes could grow to more than 50 GB. There are three issues with a default discovery mailbox that is larger than 50 GB:

It’s not supported.

It can’t be migrated to Microsoft 365 or Office 365.

If it’s the default discovery mailbox in Exchange Server 2010, it can’t be upgraded to Exchange Server 2013.

How you resolve this depends on whether you want to save the search results from a default discovery mailbox that’s exceeded 50 GB.

Use the Exchange Management Shell to delete and re-create the default discovery mailbox

Run the following command to delete the default discovery mailbox.
Remove-Mailbox “DiscoverySearchMailbox{D919BA05-46A6-415f-80AD-7E09334BB852}”

Run the following command to re-create the default discovery mailbox.
New-Mailbox -Name “DiscoverySearchMailbox{D919BA05-46A6-415f-80AD-7E09334BB852}” -Alias “DiscoverySearchMailbox{D919BA05-46A6-415f-80AD-7E09334BB852}” -DisplayName “Discovery Search Mailbox” -Discovery

Run the following command to assign the Discovery Management role group permissions to open the default discovery mailbox and view search results.
Add-MailboxPermission “DiscoverySearchMailbox{D919BA05-46A6-415f-80AD-7E09334BB852}” -User “Discovery Management” -AccessRights FullAccess -InheritanceType all

source: https://docs.microsoft.com/en-us/exchange/delete-and-re-create-default-discovery-mailbox-exchange-2013-help

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