Error when using the Search-Mailbox cmdlet

Symptoms

When you run the Search-Mailbox cmdlet by having the LogLevel parameter set to Full, the cmdlet fails and returns the following warning message:

WARNING: The Search-Mailbox cmdlet returns up to 10000 results per mailbox if a search query is specified. To return more than 10000 results, use the New-MailboxSearch cmdlet or the In-Place eDiscovery & Hold console in the Exchange Administration Center.
Cannot save changes made to an item to store.
+ CategoryInfo : InvalidArgument: (:) [], ObjectNotFoundException
+ FullyQualifiedErrorId : [Server=<server_name>,RequestId=<request_id>,TimeStamp=<date_and_time>] [FailureCategory =Cmdlet-ObjectNotFoundException] 1227BC9F
+ PSComputerName : server_name.contoso.com

However, if you run the cmdlet by having the LogLevel parameter set to Basic, the search is successful.

Cause

This issue occurs if a retention policy is set on the target mailbox that you specify in the Search-Mailbox cmdlet. The cmdlet creates an email message in the target mailbox when it runs by having the LogLevel parameter specified, and it attaches to the message a log file that includes the search results. However, the retention policy modifies this email message right after it is created. Therefore, the cmdlet can't attach the log file, and this triggers the warning.

Workaround

To work around this issue, use one of the following methods to do the search.

Method 1: Run the New-MailboxSearch cmdlet

New-MailboxSearch -Name <search_name> -SourceMailboxes mailbox1@contoso.com -TargetMailbox admin1@contoso.com -SearchQuery 'Subject:"Quarterly Results"' -LogLevel Full

Note: The New-MailboxSearch cmdlet doesn't remove the search results from the source mailbox.

Method 2: Run both the New-ComplianceSearch and New-ComplianceSearchAction cmdlets

1. To create a compliance search, run the New-ComplianceSearch cmdlet:

   New-ComplianceSearch -Name <search_name> -ExchangeLocation mailbox1@contoso.com -ContentMatchQuery 'Subject:"Quarterly Results"' -LogLevel Full
   

2. To create an action for the compliance search, run one of the following New-ComplianceSearchAction cmdlets:

   New-ComplianceSearchAction -SearchName <search_name> -Preview
   

   New-ComplianceSearchAction -SearchName <search_name> -Purge -PurgeType SoftDelete
   

   New-ComplianceSearchAction -SearchName <search_name> -Purge -PurgeType HardDelete
   

   Note: Use the Purge parameter to remove the search results from the source mailbox.

Method 3: Remove the retention policy from the target mailbox

Note

This method might cause unexpected data loss for the mailbox.

1. To remove the retention policy, run the following cmdlet:

   Set-Mailbox admin1@contoso.com -RemoveManagedFolderAndPolicy
   

2. To process the target mailbox immediately, run the following cmdlet to force the Managed Folder Assistant:

   Start-ManagedFolderAssistant admin1@contoso.com
   

3. Run the Search-Mailbox cmdlet again.