Microsoft is investigating a global outage affecting access to the Exchange Admin Center, designated as a critical service issue. Administrators are encountering "HTTP Error 500" when trying to log in, but some have found a workaround via a different URL. Microsoft is working on solutions and has started redirecting traffic to restore access temporarily.

Microsoft has acknowledged that its October security updates have disabled USB mice and keyboards in the Windows Recovery Environment (WinRE), rendering it unusable for troubleshooting. In response, an emergency update (KB5070773) has been released to address the issue, while users are advised to switch to Bluetooth or PS/2 devices in the meantime. A fix is expected to be available soon.