![]() ![]() Customers who currently store files on web servers that use Basic authentication can move those files to SharePoint Online, OneDrive for Business, or SharePoint Server on-premises as a solution. However, files stored on SharePoint Online, OneDrive for Business are not affected. ![]() Access to files stored on SharePoint on-premises server that are using basic authentication will be blocked. ![]() More information is here – Microsoft SMB Protocol Authentication – Win32 apps | Microsoft Learn. The underlying authentication layer for file share is NTLM, and there is not change to NTLM. ![]() Windows files share access is not affected.Please see Exchange Online – September 2022 Update. There is a separate effort to retire Outlook connecting to Exchange Online using Basic Authentication.Customers using basic authentication to connect to Exchange on-premises/Exchange Online can continue to use basic authentication without any changes to Exchange. This retirement will not affect Exchange Online and Exchange on-premises.Instead, it recommends moving to a more secure authentication method, preferably Modern Authentication, and enabling multi-factor authentication based on OAuth2.0 token-based auth. Microsoft will retire this feature in Office Apps version 2209+. Continued use of Basic Authentication is a big security concern, so Microsoft has decided to deprecate it from all tenants. As a result, an attacker can access these credentials and use them to access resources. Microsoft is making this change because basic authentication is a legacy authentication method that sends a username and password with each request. Microsoft 365 Apps are disabling server sign-in prompts using Basic authentication in Office Apps. MC454810 – Updated March 3, 2023: Microsoft has updated rollout timeline below. ![]()
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