Microsoft Exchange: 355,000 Servers Lack Critical Patch

Fix Released in February Only Installed on 18 Percent of Servers, Rapid7 Warns
Patch or perish alert: Less than 20 percent of vulnerable Microsoft Exchange servers have received a fix for a serious flaw that Microsoft first disclosed nearly two months ago, security firm Rapid7 warns. It also found a "concerning number" of Exchange 2007 servers, which Microsoft stopped supporting in 2017.