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Mailbox Management

Create & Remove Recipients​

Create Mail Contact​

New-MailContact -Name "name" `
    -ExternalEmailAddress "amy@contoso.com" `
    -OrganizationalUnit "MailContacts"

Create Distribution Group​

New-DistributionGroup -Name "DL_name" `
    -OrganizationalUnit "contoso.com/Managers" `
    -SAMAccountName "GroupName" `
    -Type "Distribution"

Create Room Mailbox​

New-Mailbox -Name "<room-name>" `
    -UserPrincipalName "<email>" `
    -Database "<database>" `
    -OrganizationalUnit "<OU>" `
    -Room

Mailbox Features Management​

List All Mailbox Features​

Get-CasMailbox -ResultSize Unlimited `
    -Filter {ActiveSyncEnabled -eq $true} |
    Where-Object { $_.Identity -LIKE "contoso.com/Sales/*" } |
    Select-Object DisplayName, ActiveSync* |
    Export-CSV C:\activesync.csv

Bulk Enable/Disable Features​

# Disable Outlook Anywhere (RPC over HTTP)
Get-Mailbox -ResultSize Unlimited |
    Set-CASMailbox -MAPIBlockOutlookRpcHttp $True

# Disable POP3
Get-Mailbox -ResultSize Unlimited |
    Set-CASMailbox -POPEnabled $False

# Disable IMAP
Get-Mailbox -ResultSize Unlimited |
    Set-CASMailbox -ImapEnabled $False

# Disable MAPI
Get-Mailbox -ResultSize Unlimited |
    Set-CASMailbox -MAPIEnabled $False

# Disable OWA (Outlook Web App)
Get-Mailbox -ResultSize Unlimited |
    Set-CASMailbox -OWAEnabled $False

# Disable ActiveSync
Get-Mailbox -ResultSize Unlimited |
    Set-CASMailbox -ActiveSyncEnabled $False

Note: You can target specific databases:

Get-Mailbox -Database 'DBname' -ResultSize Unlimited |
    Set-CASMailbox -ActiveSyncEnabled $False

Distribution Group Management​

Allow External Senders to Distribution Group​

Get-DistributionGroup -OrganizationalUnit 'FromNotes' |
    Set-DistributionGroup -RequireSenderAuthenticationEnabled $false

Upgrade Distribution Groups to Exchange 2010+​

Get-DistributionGroup -ResultSize Unlimited |
    Set-DistributionGroup -ForceUpgrade

List Dynamic Distribution Group Members​

$group = "DynamicGroupName"
Get-Recipient -RecipientPreviewFilter `
    (Get-DynamicDistributionGroup $group).RecipientFilter

Mailbox Quotas​

Modify Mailbox Rule Quota​

Get-Mailbox -ResultSize Unlimited |
    Set-Mailbox -RulesQuota 256KB

Change Default Database Quotas​

Set-MailboxDatabase <database-name> `
    -ProhibitSendQuota 200MB `
    -IssueWarningQuota 180MB `
    -ProhibitSendReceiveQuota 220MB

Mailbox Statistics​

Display Mailbox Sizes (Detailed)​

Get-Mailbox -ResultSize Unlimited -ErrorAction SilentlyContinue |
    Get-MailboxStatistics |
    Select-Object *, `
        @{name="TotalItemSizeInMB"; expression={[math]::Round($_.TotalItemSize.Value.ToBytes() / 1MB, 2)}}, `
        @{name="TotalDeletedItemSizeInMB"; expression={[math]::Round($_.TotalDeletedItemSize.Value.ToBytes() / 1MB, 2)}}, `
        @{name="CombinedTotalSizeInMB"; expression={
            [math]::Round($_.TotalItemSize.Value.ToBytes() / 1MB, 2) +
            [math]::Round($_.TotalDeletedItemSize.Value.ToBytes() / 1MB, 2)
        }} |
    Sort-Object CombinedTotalSizeInMB -Descending |
    Format-Table DisplayName, *MB

Display Mailbox Size Statistics​

Get-Mailbox -ResultSize Unlimited -ErrorAction SilentlyContinue |
    Get-MailboxStatistics |
    Select-Object *, `
        @{name="TotalItemSizeInMB"; expression={[math]::Round($_.TotalItemSize.Value.ToBytes() / 1MB, 2)}}, `
        @{name="TotalDeletedItemSizeInMB"; expression={[math]::Round($_.TotalDeletedItemSize.Value.ToBytes() / 1MB, 2)}}, `
        @{name="CombinedTotalSizeInMB"; expression={
            [math]::Round($_.TotalItemSize.Value.ToBytes() / 1MB, 2) +
            [math]::Round($_.TotalDeletedItemSize.Value.ToBytes() / 1MB, 2)
        }} |
    Sort-Object CombinedTotalSizeInMB -Descending |
    Measure-Object CombinedTotalSizeInMB -Sum -Average -Maximum -Minimum

Mailbox Size and Last Logon (with Database Location)​

Get-Mailbox -Database mbdb4 |
    Select-Object DisplayName, PrimarySmtpAddress,
        @{n='ItemCount'; e={(Get-MailboxStatistics -Identity $_.DisplayName).ItemCount}},
        @{n='TotalItemSize'; e={(Get-MailboxStatistics -Identity $_.DisplayName).TotalItemSize}},
        @{n='LastLogonTime'; e={(Get-MailboxStatistics -Identity $_.DisplayName).LastLogonTime}},
        @{n='LastLogoffTime'; e={(Get-MailboxStatistics -Identity $_.DisplayName).LastLogoffTime}} |
    Sort-Object TotalItemSize -Descending |
    Select-Object -Property DisplayName, PrimarySmtpAddress, ItemCount, TotalItemSize, LastLogonTime, LastLogoffTime |
    Export-CSV D:\mailboxList1.csv -Encoding "UTF8"

Database Mailbox Statistics Export​

Get-MailboxStatistics -Database "MBDB4" |
    Select-Object DisplayName, ItemCount, TotalItemSize, LastLogonTime, LastLogoffTime |
    Sort-Object TotalItemSize -Descending |
    Export-CSV D:\List.csv -Encoding "UTF8"

Check Last Logon Time​

Get-Mailbox | Get-MailboxStatistics |
    Sort-Object LastLogonTime -Descending

Logon Statistics​

Get-LogonStatistics -Database <database-name> | Format-List

ActiveSync Device Management​

List ActiveSync Devices for User​

Get-ActiveSyncDeviceStatistics -Mailbox <user> |
    Format-Table DeviceType, DeviceUserAgent, LastSuccessSync

Mailbox Permissions​

Show Mailbox Permissions​

Get-Mailbox <identity> | Get-MailboxPermission -User <username>

Get Mailbox by Type​

Get-Mailbox -RecipientTypeDetails UserMailbox