. Microsoft® Exchange Online Plan 1 Open Shared Subscriptions-Volume License Government OPEN 1 License No Level Qualified Annual Exchange Online provides advanced security & reliability to help protect your information. Maintain the latest defenses. against malware & spam with a service that handles hundreds of millions of messages around the world every day & is updated to address new malware & spam threats quickly. Data Loss Prevention (DLP). capabilities prevent users from mistakenly sending sensitive information to unauthorized people while informing them of internal compliance policies. Safeguard your data. by hosting it in geographically distributed data centers with continuous data backup premier disaster recovery capabilities & a team of security experts monitoring Exchange Online around the clock. Deliver reliability availability. & performance with a guaranteed 99.9% uptime financially-backed service level agreement. .