Get-MailboxType.ps1

#Given the value from "msExchRecipientDisplayType" attribute
#in active directory will translate to the MailboxType

# https://answers.microsoft.com/en-us/msoffice/forum/msoffice_o365admin-mso_exchon-mso_o365b/recipient-type-values/7c2620e5-9870-48ba-b5c2-7772c739c651
function Get-MailboxType ($DisplayType){
    switch ($DisplayType) {
        -2147483642 {"RemoteUserMailbox"}
        -2147481850 {"RemoteRoomMailbox"}
        -2147481594 {"RemoteEquipmentMailbox"}
        0           {"UserMailbox (shared)"}
        1           {"MailUniversalDistributionGroup"}
        6           {"MailContact"}
        7           {"UserMailbox (room)"}
        8           {"UserMailbox (equipment)"}
        1073741824  {"UserMailbox"}
        1073741833  {"MailUniversalSecurityGroup"}
    }
}