Microsoft Teams Classic has officially ceased operations, with all backend services disabled and servers shut down. Many organizations delayed their migrations despite prior announcements, leading to user disruptions and increased support tickets. A study by the UK’s Royal Institution of Chartered Surveyors found that over a quarter of UK businesses experienced cyberattacks in the past year, and nearly three-quarters of business leaders anticipate cybersecurity disruptions within the next one to two years. The end of support for Windows 10 is set for October 14, 2025, presenting further challenges for IT teams, particularly in regulated sectors. Organizations face hurdles in migration due to budget constraints, lack of visibility into legacy dependencies, and staff turnover. IT teams must deploy the new Teams client, disable Teams Classic, and ensure clear communication and documentation to mitigate risks.