Everything ok, I received a sticker with an active code. The invoice was correctly sent by mail. The system could not be activated electronically, it was necessary to have call at an automated Microsoft line. 5 minutes and Windows was activated;)
Exchange Server 2013 Standard User CAL

- Transferable license (online activation)
- 1 license for 1 user only
- CALs (= Client Access Licenses)
- Used for accessing Exchange Server 2013 or older
- No expiration date
- License certificate
- Documentation in accordance with the EU laws (Seller's Declaration)
- Confirmation of purchase (invoice)
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Exchange Server 2013 Standard User CAL
Microsoft Exchange Standard 2013 CALs provide access to Windows Exchange Standard 2013 or any of the previous versions. They give device the right to legally access a server installed with Windows Server software.
Note: This is just a user access license, you can find the Windows Server 2013 programs here: Microsoft Exchange Server Standard 2013 or Microsoft Exchange Server Enterprise 2013.