SharePoint Sever 2010 is approaching end of support and organisations still running any 2010 instances need to rapidly act before extended support ends.
Microsoft products all follow a standard release cycle having five years of standard support in which the product receives enhancements, updates and security fixes and then five years of extended support. During extended support, products only receive security patches and fixes so the solution will not modernise but remains secure. Once extended support ends, the product no longer receives critical security patches, which means that any vulnerabilities that are found after this date can be exploited and expose the organisation to security risks.
Microsoft SharePoint Server 2010 was due to reach end of extended support this week but it has been automatically extended to 13th April 2021, however this does not leave much time for those still running 2010.