Set calendar permissions using Attributes in Exchange 2010 Powershell

Try this, customize the value of $group in first line.

$group = "yourdomain\HR"

$mbxs = Get-User -RecipientTypeDetails usermailbox | ?{$_.department -eq "HR"}| Get-Mailbox 

$mbxs | %{
    $smtp = $_.primarysmtpaddress.tostring() 
    $folder = $_ | Get-MailboxFolderStatistics  -FolderScope calendar | Select-Object -ExpandProperty name 
    Add-MailboxFolderPermission -Identity "$($smtp):\$folder" -AccessRights owner -User $group
}

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A bit more optimised solution is below. The main difference between Chris' solution and mine, is that my works also in an international environment, where the folder Calendar has name in a different language.

$group = "yourdomain\HR"  

$mbxs = Get-User -RecipientTypeDetails usermailbox -Filter {department -eq "HR"} | Get-Mailbox 

$mbxs | %{
    $folder = $_ | Get-MailboxFolderStatistics  -FolderScope calendar | Select-Object -ExpandProperty name 
    Add-MailboxFolderPermission -Identity "$($_.PrimarySMTPAddress):\$folder" -AccessRights owner -User $group}

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Thanks for your input both, I have run the following which seems to change the permissions on my calendar but not on any others in the group

get-user -filter { Department -eq "Department" } -RecipientType UserMailbox | ForEach-Object {
Set-MailboxFolderPermission "$($_.PrimarySmtpAddress):\Calendar" -User manager@company.com -AccessRights Reviewer }

I am testing it with one user getting access first before I start using groups, any ideas?

Thanks
M@

Is this returning the right number of users?

get-user -filter { Department -eq "Department" } -RecipientType UserMailbox

I think you'll want Add- instead of Set- for the permission as well. I think Set- will only modify the right if it's already there.

Chris

Thanks Chris, running the above command lists all the users within the specific Department.   I tried using add and it says that the permission already exists, it still seems to me that its trying to set it on my own account over and over.

M@

soos, when i try to run your version it returns

A parameter cannot be found that matches parameter name 'Identity'.

M@

Thanks soos, took it exactly as you had written it there, think it may have been because i was chopping your expert work up, should of listened to you in the first place!
Some points for Chris too for helping

Thanks for your help!

M@