Mailbox helpers

Requires an EXO session. For full and always-up-to-date details, use Get-Help <FunctionName> -Detailed.

Add-MboxAlias / Remove-MboxAlias

Add or remove SMTP aliases on a recipient.

Syntax

Add-MboxAlias -SourceMailbox <String> -MailboxAlias <String>
Remove-MboxAlias -SourceMailbox <String> -MailboxAlias <String>

Parameter	Description	Required
SourceMailbox (Identity)	Target mailbox/recipient. Pipeline accepted.	Yes
MailboxAlias	Alias (SMTP address) to add/remove.	Yes

Examples

Add-MboxAlias -SourceMailbox 'info@contoso.com' -MailboxAlias 'alias@contoso.com'

Add-MboxAlias -Identity 'user@contoso.com' -Aliases 'user.sales@contoso.com','user.eu@contoso.com'

Remove-MboxAlias -SourceMailbox 'info@contoso.com' -MailboxAlias 'alias@contoso.com'

Add/Remove/Get/Export-MboxPermission

Manage mailbox permissions and export them to CSV.

Syntax

Add-MboxPermission -Identity <String> -User <String> -AccessRights <String[]> [-AutoMapping]
Remove-MboxPermission -Identity <String> -User <String> -AccessRights <String[]>
Get-MboxPermission -Identity <String>
Export-MboxPermission -Identity <String> [-CsvFolder <String>]

Parameter	Description	Required (Add/Remove)
Identity	Target mailbox.	Yes
User	Principal to grant/revoke.	Yes
AccessRights	Rights (e.g., FullAccess, SendAs, SendOnBehalf).	Yes (Add)
AutoMapping	Enable/disable Outlook automapping.	No
CsvFolder (Export)	Destination folder for CSV export.	No

Examples

Add-MboxPermission -Identity 'shared@contoso.com' -User 'john@contoso.com' -AccessRights FullAccess -AutoMapping:$false

Remove-MboxPermission -Identity 'shared@contoso.com' -User 'john@contoso.com' -AccessRights FullAccess

Export-MboxPermission -Identity 'shared@contoso.com' -CsvFolder 'C:\Temp'

Get-MboxPermission -Identity 'shared@contoso.com'

Get/Export-MboxAlias

List or export aliases for auditing.

Syntax

Get-MboxAlias -Identity <String>
Export-MboxAlias -Identity <String> [-CsvFolder <String>]

Parameter	Description	Required
Identity	Target mailbox/recipient.	Yes
CsvFolder (Export)	Destination folder for CSV export.	No

Examples

Get-MboxAlias -Identity 'user@contoso.com'

Export-MboxAlias -Identity 'user@contoso.com' -CsvFolder 'C:\Temp'

Set-MboxLanguage

Set mailbox UI language, time zone, and regional settings.

Syntax

Set-MboxLanguage -UserPrincipalName <String> [-Language <String>] [-TimeZone <String>]
                 [-DateFormat <String>] [-TimeFormat <String>]

Parameter	Description
UserPrincipalName (Identity)	Target mailbox.
Language	Culture code (e.g., it-IT, en-US).
TimeZone	Time zone ID (e.g., W. Europe Standard Time).
DateFormat / TimeFormat	Optional overrides.

Example

Set-MboxLanguage -UserPrincipalName 'user@contoso.com' -Language it-IT -TimeZone "W. Europe Standard Time"

Set-MboxRulesQuota

Adjust inbox rules quota for a mailbox.

Syntax

Set-MboxRulesQuota -Identity <String> -RulesQuotaInKB <Int>

Parameter	Description
Identity	Target mailbox.
RulesQuotaInKB	New quota in KB.

Example

Set-MboxRulesQuota -Identity 'user@contoso.com' -RulesQuotaInKB 128

New-SharedMailbox

Create a shared mailbox.

Syntax

New-SharedMailbox -Name <String> -Alias <String> -PrimarySmtpAddress <String> [-Members <String[]>]
                  [-Language <String>] [-TimeZone <String>]

Parameter	Description	Required
Name	Display name.	Yes
Alias	Mail alias.	Yes
PrimarySmtpAddress	Primary SMTP.	Yes
Members	Members to grant FullAccess/SendAs.	No
Language / TimeZone	Optional localization.	No

Example

New-SharedMailbox -Name "Support" -Alias 'support' -PrimarySmtpAddress 'support@contoso.com' -Members 'agent1@contoso.com','agent2@contoso.com'

Set-SharedMboxCopyForSent

Toggle saving sent items for delegated send-as/send-on-behalf.

Syntax

Set-SharedMboxCopyForSent -Identity <String> [-Enable]

Parameter	Description	Required
Identity	Shared mailbox.	Yes
Enable	Switch to enable; omit for disable.	No

Example

Set-SharedMboxCopyForSent -Identity 'shared@contoso.com' -Enable

Test-SharedMailboxCompliance

Quick checks on shared mailbox configuration (permissions, quotas, sent-items copy).

Syntax

Test-SharedMailboxCompliance -Identity <String>

Parameter	Description
Identity	Shared mailbox to validate.

Example

Test-SharedMailboxCompliance -Identity 'shared@contoso.com'

Get-UserLastSeen

Return the most recent activity for a mailbox combining Exchange LastUserActionTime and (when available) Entra ID sign-in logs.

Syntax

Get-UserLastSeen -User <String>

Parameter	Description
User (Identity, UserPrincipalName)	Target mailbox identity. Pipeline accepted.

Example

Get-UserLastSeen -User 'alice@contoso.com'

Notes:

• Requires Exchange Online connection. Graph sign-in logs are included when AuditLog.Read.All + Directory.Read.All scopes are available.
• Output includes LastUserActionTime, LastInteractiveSignIn, LastSeen, and the Source used.