Mimecast Limited provides cloud security and risk management services for corporate information and email.

The company offers Mimecast Email Security solution, which protects against the delivery of malware, malicious URLs and attachments, spam, viruses, impersonation attacks, phishing, and spear-phishing attacks, including business email compromise, identity theft, extortion, fraud, and other attacks, while also preventing data leaks and other internal threats, as well as provides awareness training services.

It also provides Cyber Resilience Extensions, such as Mimecast Enterprise Information Archiving that unifies email data to support e-discovery, forensic analysis, and compliance initiatives; Mimecast Business Continuity and Sync & Recover, which protects email and data against the threat of downtime as a result of system failure, natural disasters, planned maintenance, system upgrades, and migrations; and Mimecast Web Security service that protects against malicious web activity initiated by user action or malware and blocks access to inappropriate websites based on acceptable use policies.

In addition, the company's Cyber Resilience Extensions also comprise Mimecast Secure Messaging, a secure and private channel to share sensitive information; Mimecast Health Care Pack, which prevents breaches and protects against data exfiltration transmissions; and Mimecast Large File Send that enables employees to create security and compliance risks when they turn to file sharing services.

Further, it offers Threat Intelligence Dashboard, which displays cyber threat data specific to an organization by identifying users who pose the greatest cyber risk; and Mimecast Mobile and Desktop Apps for mobile, PC, and Mac users, as well as engages in data center operations.

The company sells its services through direct sales and channel partners.

Mimecast Limited was founded in 2003 and is headquartered in London, the United Kingdom.

As of May 19, 2022, Mimecast Limited was taken private.