OAuth is a technological standard that allows you to authorize one app or service to sign in to another without divulging private information, such as passwords. OAuth provides that simplicity of experience by giving you the option to authorize two apps to share some of your data without revealing your credentials. It strikes a balance between convenience and security.
Importantly, OAuth does not grant a third-party app or service unlimited access to your data. Part of the protocol is specifying what data the third party is allowed to access (in this case the users email address) and what it can do with that data. Setting such limitations, and protecting identities in general.
P11D Organiser uses the access token to send email via Microsoft Graph API. The token has an expiry and can be refreshed using our token refresh feature in the P11D Software.

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