get-mailbox mailboxname| f1 singleitem*
–To set single item recovery on all users in a specific database run the following command:
Get-Mailbox -Database <DatabaseName> | Set-Mailbox -SingleItemRecoveryEnabled $true
–And for newly created mailboxes (24h):
Get-Mailbox -Database <DatabaseName> | Where { $_.WhenCreated -gt (get-date).adddays(-1) } | Set-Mailbox -SingleItemRecoveryEnabled $true
–Enabling Single Item Recovery
( By Server)
Get-Mailbox -Server servername| Set-Mailbox -SingleItemRecoveryEnabled $true
(By Database)
Get-mailbox -database dbname | Set-Mailbox -SingleItemRecoveryEnabled $true
Ex-Shell 