Find the Exchange system mailbox that does OAB generation

For my future self :)

Get-Mailbox -Arbitration | where {$_.PersistedCapabilities -like "*oab*"}

1	Get-Mailbox -Arbitration \| where {$_.PersistedCapabilities -like "oab"}

If I want to change this to some other mailbox:

New-Mailbox -Arbitration -Name "OAB Mailbox" -UserPrincipalName OABMailbox@rakhesh.labs -Alias OABMailbox
-DisplayName "OABMailbox" -Database DAGDB1

Set-Mailbox -Identity "OAB Mailbox" -Arbitration -OABGen $true -MaxSendSize 500MB

Set-OfflineAddressBook "Default Offline Address Book" -GeneratingMailbox OABMailbox

New-Mailbox -Arbitration -Name "OAB Mailbox" -UserPrincipalName OABMailbox@rakhesh.labs -Alias OABMailbox

-DisplayName "OABMailbox" -Database DAGDB1

Set-Mailbox -Identity "OAB Mailbox" -Arbitration -OABGen $true -MaxSendSize 500MB

Set-OfflineAddressBook "Default Offline Address Book" -GeneratingMailbox OABMailbox

Once the mailbox generates the OAB it stores it at %ExchangeInstallPath%ClientAccess\OAB\.