Back in july 2010 I created a script to set the default AccessRight to Reviewer for Exchange 2010. This was a new feature for Exchange 2010 that we could use the command Set-MailboxFoldersPermission to change AccessRights on specific folders on the server level. As the calendar is a folder we now could do this organization wide using PowerShell.

The reason for creating this script is when migrating customers in Norway most of them want to allow everyone to use side by side calendaring in Outlook and Oulook Web App. In Exchange 2003/2007 we needed to instruct users how to set Default to Reviewer. This script sets it for all users. The script works for both Exchange Online and Exchange Server 2010. For Exchange 2007 check out this post on how to do it: http://exchangeshare.wordpress.com/2008/05/27/faq-give-calendar-read-permission-on-all-mailboxes-pfdavadmin/

Get the script here: http://msunified.net/exchange-downloads/script-set-calendarpermissions-ps1/

What the script does

As the picture shows you get three menu items.

1. Will set the permission on all users and resources
2. Will set the permission on all users and reources created the last 30 days
3. Will give a user you specify Editor access to a mailbox you specify
• This is good for switchboard or secretary functions

How to run the script against an Exchange Online environment

• Connect to Exchange Online through PowerShell Remoting

$cred = Get-Credential
$Session = New-PSSession -ConfigurationName Microsoft.Exchange -ConnectionUri https://ps.outlook.com/powershell -Credential $cred -Authentication Basic -AllowRedirection
Import-PSSession $Session

• Set Execution Policy to unrestricted

Set-ExecutionPolicy Unrestricted

• Run the script by copying the script, saving it as a ps1 file, navigate to it in PowerShell and start typing set-Cal and hit TAB to use TAB completion

.\Set-CalendarPremissions.ps1

Resources

Administering Microsoft Office 365 using Windows PowerShell: http://blog.powershell.no/2011/05/09/administering-microsoft-office-365-using-windows-powershell/