Microsoft says it is testing a fix to an outage affecting Exchange Online and Outlook, lasting for 17+ hours from around 11:30AM ET on Monday (Sarah Perez/TechCrunch)

Microsoft confirmed it is testing a remediation for the Exchange Online and Outlook outage that began around 11:30 a.m. ET on Monday and persisted for more than 17 hours. The fix aims to restore full service functionality for affected users, and the company is monitoring the rollout to ensure stability.