Hi IG-4542,
This is possible. First, you will need to find the name of your DiscoveryMailbox:
Get-Mailbox –RecipientTypeDetails DiscoveryMailbox | export-csv c:\temp\disc.csv
Then run the below PowerShell code:
$UserCredential = Get-Credential
$exchangeSession = New-PSSession -ConfigurationName Microsoft.Exchange -ConnectionUri https://outlook.office365.com/powershell-liveid/" -Credential $UserCredential -Authentication "Basic" -AllowRedirection
Import-PSSession $exchangeSession -DisableNameChecking
Get-Mailbox -ResultSize Unlimited | Search-Mailbox -SearchQuery 'Subject:"Some Text"' -targetmailbox "DiscoverySearchMailbox{Your ID number}" -targetfolder "SearchResult" -logonly -loglevel full
Get-Mailbox -ResultSize Unlimited | Search-Mailbox -SearchQuery 'Body:"Some Text"' -targetmailbox "DiscoverySearchMailbox{Your ID number}" -targetfolder "SearchResult" -logonly -loglevel full
You then need to add the DiscoverySearchMailbox to your Outlook to see the results.
--If the reply is helpful, please Upvote and Accept as answer--