Add folder level permissions on all folders in a given mailbox

folder_permissions_bulk

$mailbox = "shared@domain.com"

$folders = Get-MailboxFolderStatistics $mailbox | ? {$_.FolderType -ne “Root” -and $_.FolderType -ne “Recoverableitemsroot” -and $_.FolderType -ne “Audits” -and $_.FolderType -ne “CalendarLogging” -and $_.FolderType -ne “RecoverableItemsDeletions” -and $_.FolderType -ne “RecoverableItemspurges” -and $_.FolderType -ne “RecoverableItemsversions”}

Add-MailboxFolderPermission $mailbox -User user@domain.com -AccessRights Reviewer #root permissions

foreach ($folder in $folders) {
    $FolderPath = $folder.FolderPath.Replace("/","\").Replace([char]63743,"/") #with PowerShell v3 'fix'
    $MailboxFolder = "$mailbox`:$FolderPath"
    Add-MailboxFolderPermission "$MailboxFolder" -User user@domain.com -AccessRights Reviewer
}