This Handbook is an UNOFFICIAL document prepared by MSCA-NET, the EU-funded project of National Contact Points (NCP) for the Marie Skłodowska-Curie Actions (MSCA). The information contained in this document is intended to assist and support, unofficially and practically, anyone submitting a proposal to the MSCA Staff Exchanges Call with the deadline of 8 March 2023 [check again here for the updated version]. This document is not, by any means, a substitute for official documents published by the European Commission, which in all cases must be considered binding. As such, this document is to be used in addition to the official call documents: MSCA Work Programme, Guide for Applicants for Staff Exchanges 2022, and official FAQs prepared by the European Research Executive Agency (REA).