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What is the impact?ÌýÌý

• Maintenance and updates will continue from December 2021 to May 2022 for on-premises SharePoint. These updates will only be completed during working hours, on the second Wednesday of every month. Browsers may need to be refreshed during updates.
• The on-premises SharePoint development environment will no longer be available beginning December 1, 2021.ÌýÌý
• On-premises SharePoint sites will no longer be accessible after May 2022. 

What do site owners need to do? If you have not already migrated your site: 

•  for migration to SharePoint Online and/or Microsoft Teams. 
•  if you are unsure of your site migration status, or are ready to migrate, and include the name of your site.