What is the advantage of using the EWS header method over the OWA method for Exchange version detection?

The EWS method returns an exact build number (e.g., 15.1.2375.24) from the `X-OWA-Version` header, which can be directly mapped to a specific release date on Microsoft's official build numbers page. This allows precise vulnerability assessment. In contrast, the OWA method only yields an approximate version (e.g., 15.1.2375) that corresponds to a range of builds, making it less precise. However, the EWS method is not universal and may fail on older Exchange versions. For a practical example, refer to the Exchange version detection article.