As I mentioned in another post, you can force a EoL mailbox to take on a SMTP with this command:
Set-Mailbox User.Name -WindowsEmailAddress User.Name@Bohemiangrove.co.uk
But occasionally it won’t work:
The proxy address "SMTP:User.Name@Bohemiangrove.co.uk" is already being used by the proxy addresses or LegacyExchangeDN of "User.Name_bohemiangrove.co.uk#EXT#". Please choose another proxy address. + CategoryInfo : NotSpecified: (Adri Donkers:ADObjectId) [Set-Mailbox], ProxyAddressExistsException + FullyQualifiedErrorId : [Server=VI1PR04MB4349,RequestId=8938a92c-006d-4f9f-b230-937f591d20e4,TimeStamp=22/10 /2018 06:18:53] [FailureCategory=Cmdlet-ProxyAddressExistsException] 169E5E0,Microsoft.Exchange.Management.Rec ipientTasks.SetMailbox + PSComputerName : ps.outlook.com
So to find who’s using the address you can search all of Azure using:
Get-Recipient | where {$_.EmailAddresses -match "User.Name@Bohemiangrove.co.uk"} | fL Name, RecipientType,emailaddresses
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