Get a list of all mail-enabled objects in Office 365

Run PowerShell cmdlet:

Get-Recipient -ResultSize unlimited

This list can be filtered with the -RecipientType parameter with the following switches:

• ArbitrationMailbox

• ConferenceRoomMailbox

• Contact

• DiscoveryMailbox

• DynamicDistributionGroup

• EquipmentMailbox

• ExternalManagedContact

• ExternalManagedDistributionGroup

• LegacyMailbox

• LinkedMailbox

• MailboxPlan

• MailContact

• MailForestContact

• MailNonUniversalGroup

• MailUniversalDistributionGroup

• MailUniversalSecurityGroup

• MailUser

• PublicFolder

• RoleGroup

• RoomList

• RoomMailbox

• SharedMailbox

• SystemAttendantMailbox

• SystemMailbox

• User

• UserMailbox