Hidden from Addresslist

Get-mailbox | where-object {$_.HiddenFromAddressListsEnabled -ilike „True“} | select Alias, Hidden* | export-csv C:\Users1.csv

Import-CSV „C:\Users1.csv“ | ForEach {set-mailbox $_.Alias -HiddenFromAddressListsEnabled $False}

Import-CSV „C:\Users1.csv“ | ForEach {set-mailbox $_.Alias -HiddenFromAddressListsEnabled $True}