Added Files

Powershell/PowerShell-Office365Admin/Exchange/GrantCalendarDelegateAccess.ps1

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+# Script to grant access rights on mailboxes
+#
+
+# Mailboxes to grant rights on
+$grantRightsOnMailboxes = @('','')
+
+# Users to grant rights to
+$grantRightsToUsers = @('','')
+
+# Rights to grant
+$accessRights = 'Editor'
+
+# Establish a session to Exchange Online
+$credentials = Get-Credential -Message 'Enter your Exchange Online administrator credentials'
+$connectionParams = @{
+    'ConfigurationName' = 'Microsoft.Exchange';
+    'ConnectionUri' = 'https://outlook.office365.com/powershell-liveid/';
+    'Credential' = $credentials;
+    'Authentication' = 'Basic';
+    'AllowRedirection' = $true
+} 
+$exchangeSession = New-PSSession @connectionParams
+Import-PSSession -Session $exchangeSession
+
+# Apply the permissions
+foreach ($grantRightsToUser in $grantRightsToUsers ) {
+    foreach ($grantRightsOnMailbox in $grantRightsOnMailboxes) {
+        $calendarIdentity = $grantRightsOnMailbox + ':\Calendar'
+        $existingPermissions = Get-MailboxFolderPermission -Identity $calendarIdentity -User $grantRightsToUser -ErrorAction SilentlyContinue
+        if (!($existingPermissions)) {
+            Add-MailboxFolderPermission -Identity $calendarIdentity -User $grantRightsToUser -AccessRights $accessRights
+        }
+        else {
+            Set-MailboxFolderPermission -Identity $calendarIdentity -User $grantRightsToUser -AccessRights $accessRights
+        }
+        Set-Mailbox -Identity $upn –GrantSendOnBehalfTo @{add=$editor}
+    }
+}
+
+# End the PowerShell session
+Remove-PSSession -Session $exchangeSession