This rule detects unauthorized modifications to the Windows registry related to Microsoft Outlook's WebView and Today features. Specifically, it targets changes made to the 'URL' values stored in the corresponding registry paths. When a URL is set in these registry locations, it may indicate attempts by attackers to manipulate Outlook's web-based content. This behavior is critical to monitor, as it might facilitate phishing, data theft, or other forms of compromise. The detection leverages Sysmon EventID 13 to monitor registry changes, focusing on paths indicative of malicious activity, thus providing security teams with necessary insights for threat mitigation.