Power Automate can be used to change the subject line of an email by calling the Microsoft Graph API with the Outlook Send An HTTP Request action. This can be done without any premium licensing. The article provides a step-by-step guide on how to change an email subject in Power Automate, including configuring the "When A New Email Arrives" trigger settings and using the Microsoft Graph API to update the subject line. The flow can be tested by sending an email to the target inbox, and the subject line will be updated accordingly.
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