ExchangePowershell

Connect to O365 Exchange

• $UserCredential = Get-Credential
  • $Session = New-PSSession -ConfigurationName Microsoft.Exchange -ConnectionUri https://outlook.office365.com/powershell-liveid/ -Credential $UserCredential -Authentication Basic -AllowRedirection
    • Import-PSSession $Session -DisableNameChecking

Then to close the session

• Remove-PSSession $Session

Hide O365 group from GAL ( as this cannot be done on admin portal )

• Set-UnifiedGroup <group> -HiddenFromAddressListsEnabled $true

Handy Commands for Exchange Powershell

• Add permission to calendar:
  • This will give a user permissions to another calendar
    • Set-MailboxFolderPermission “CalendarName:\calendar” –User default –AccessRights reviewer

• Send on Behalf
  • This will grant Charles permissions to send on behalf of Gert.
    • Set-Mailbox gert.mailbox -GrantSendOnBehalfTo charles.surname
• Send As
  • This will grant Charles permissions to send as Gert.
    • Add-ADPermission gert.mailbox -ExtendedRights Send-As -user charles.surname
• Full Mailbox Access
  • This will grant Charles full access to Gert's mailbox.
    • Add-MailboxPermission -Identity gert.mailbox -User charles.surname

Add full access permission to all mailboxes to an account:

• Get-Mailbox -ResultSize unlimited -Filter {(RecipientTypeDetails -eq 'UserMailbox') -and (Alias -ne 'Admin')} | Add-MailboxPermission -User UserAccount@domain.com -AccessRights fullaccess -InheritanceType all -AutoMapping:$False

Add Send as permissions to mailboxes:

• $UserMailboxes = Get-Mailbox | Where {$_.RecipientTypeDetails -eq “<Type of mailbox>”}
  • $UserMailboxes | Add-RecipientPermission -AccessRights SendAs –Trustee <identity>

Get all disconnected mailboxes:

• $dbs = Get-MailboxDatabase; $dbs | foreach {Get-MailboxStatistics -Database $_.DistinguishedName} | where {$_.DisconnectReason -eq "Disabled"} | Format-Table DisplayName,Database,DisconnectDate

Exchange issues Powershell

Check the Database availability groups cmdlet - use to find out if exchange server is the Primary or Secondary

• Get-DatabaseAvailabilityGroup

You can get all the details you need by using the following command:

• Get-DatabaseAvailabilityGroup | fl

• Get-DatabaseAvailabilityGroup -status

Sometimes the witness will fail, you can check the status of the witness by using the cluster resource cmdlet:

• ipmo failoverclusters

• Get-ClusterResource

This will tell you where the witness stores the file. If the DAG finds the resource unrelibale it might mark it as failed - you can restart this by using start-cluster resource:

• Get-ClusterResource | Start-ClusterResource

Get the log for the cluster

• Get-ClusterLog -Destination <File pathway>