| Feature | Details and mitigation | Deprecation announced |
|---|---|---|
| TLS server authentication certificates using RSA keys with key lengths shorter than 2048 bits | Support for certificates using RSA keys with key lengths shorter than 2048 bits will be deprecated. Internet standards and regulatory bodies disallowed the use of 1024-bit keys in 2013, recommending specifically that RSA keys should have a key length of 2048 bits or longer. For more information, see Transitioning of Cryptographic Algorithms and Key Sizes - Discussion Paper (nist.gov). This deprecation focuses on ensuring that all RSA certificates used for TLS server authentication must have key lengths greater than or equal to 2048 bits to be considered valid by Windows. TLS certificates issued by enterprise or test certification authorities (CA) aren't impacted with this change. However, we recommend that they be updated to RSA keys greater than or equal to 2048 bits as a security best practice. This change is necessary to preserve security of Windows customers using certificates for authentication and cryptographic purposes. | March 2024 |
| Test Base | Test Base for Microsoft 365, an Azure cloud service for application testing, is deprecated. The service will be retired in the future and will be no longer available for use after retirement. | March 2024 |
Source:
Deprecated features in the Windows client
Review the list of features that Microsoft is no longer actively developing in Windows 10 and Windows 11.
learn.microsoft.com
