The Register | Security Follow Microsoft 365 calendars become spy drop boxes in HOLLOWGRAPH campaign Malware hides commands in appointments set for 2050 and uses Redmond's own cloud to phone home Hacker & Security News on Bluesky @hacker.at.thenote.app bsky.app https://www.theregister.com/security/2026/07/20/microsoft-365-calendars-become-spy-drop-boxes-in-hollowgraph-campaign/5274982 theregister.com
