Microsoft's donation of Teams to the NHS is considered a monopoly suspect by rivals and the British government has introduced

In March 2020, Microsoft generously donated to the UK's National Health Service (NHS) by providing them with a free license to Microsoft Teams. But after receiving many reports from competitors that this practice had hurt their competitiveness, the British government began to re-examine the "big package" given by Microsoft.

Competitors believe that this is Microsoft's follow-up order for health infrastructure in the name of charity, thus using it as leverage. Competitors believe that Microsoft claims to save the NHS millions of employees' time, but the price will be even greater in the future.

Competitors believe that Microsoft's license updates will not only be incredibly expensive, but it will also be too late to find a cheaper and more frank system. This "NHS shuffle" is a useful distraction, but Microsoft's antitrust cases are growing.

The complaints led Commerce Minister Kwasi Kwarteng's division to launch an investigation into the NHS's IT systems, dubbed the "hidden takeover", which confirmed they were looking into whether Microsoft's business practices raised anti-competitive issues.

Microsoft has become the subject of a similar complaint from Slack in the European Union, where Slack accused it of taking over the market by bundling Teams with Office for free.