Order Status

or search frequently asked questions:

Are customers notified when the status of their order is changed?
Are there ready email templates for custom order statuses?
Can I delete an order status created with this extension?
Can custom emails include attachments?
What is the difference between Magento order status and order state?
Status does not apply correctly. Empty cells are on the grid.
The button "Edit Default Order Statuses" does not appear.