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Assigning everyone permission to read each others calendar Exchange 2013

I had a request from a customer the other week asking if it is possible to grant all users read only permission to each other’s calendars in Exchange 2013. The only way to achieve this in bulk is using Exchange Management Shell. Below is the script I created to filter out distribution, room and discovery mailboxes and apply only to user mailboxes

$LogFile = “c:\CalendarPermissions.txt” ;

$Mailbox = Get-Mailbox -Filter {(RecipientType -eq “UserMailbox” -and Name -notlike “Discovery*”)} -ResultSize Unlimited;

ForEach ($MailUser in $Mailbox){

Set-MailboxFolderPermission -Identity ($MailUser.alias+’:\Calendar’) -User Default -AccessRights Reviewer;
$MailUser.Name | Out-File $LogFile -Append
Get-MailboxFolderPermission -Identity ($MailUser.Name+’:\Calendar’) | Out-File $LogFile -Append;

Write-Host “All Users have been granted Reviewer Rights to $MailUser Calendar” -ForegroundColor Green;

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