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Sunsetless EWS

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Sunsetless EWS is a .NET library that replaces Microsoft's EWS Managed API package. Existing EWS code keeps compiling, and its calls run on Microsoft Graph after Exchange Online retires EWS. To switch, you change one NuGet package reference and add your Entra app details and a license key. The library runs inside your application and calls Graph through your own app registration, so mail never passes through our servers. In a hybrid setup, calls for on-premises Exchange stay on EWS. Each supported operation is tested field by field against recorded EWS responses, and the compatibility page on sunsetless.com lists the known differences. The library runs on .NET Framework and modern .NET, and a free trial key is available on the site.

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