We are the global Zimbra experts with customers in 20 states and 10 countries.

Our proprietor, Mark Stone, adopted Zimbra for his own company in 2005 and became a Zimbra Partner in 2006.  We have deep Zimbra technical expertise as well as Zimbra application expertise in multiple industry verticals, including healthcare, financial services, construction, law enforcement, municipal, marketing services, non-profits, software development, telecom and application services providers.  We actually provide paid support to other Zimbra Partners

For many years, Mr. Stone has been a moderator on the Zimbra forums, maintains in-person relationships with senior Zimbra and ZeXtras developers and Synacor executives, and is an active contributor in the greater Zimbra community. He has co-exhibited with Zimbra at various trade shows; contributed to a number of Zimbra wiki articles, and; worked with Zimbra Support to identify and squash a number of Zimbra bugs.  Mr. Stone was the first Zimbra partner in North America to pass the rigorous Zimbra Sales Certification exam and is a Certified Zimbra Trainer.

After a successful stint as the Chief Information Officer for a global barter company based in New York City (which had 19 offices in 16 cities and which directed some $1.2 billion of corporate procurement spend), Mr. Stone founded a profitable Managed Services Provider and Cloud Hosting company, later acquired by a telecom company.

Mr. Stone designed, deployed and hosted a Zimbra multi-server system for a marketing services company that hosted more than 20,000 email domains. He helped a multi-national retailer to support the Zimbra system they used to host email for more than 6,000 employees. He has also deployed and hosted HIPAA-compliant Zimbra systems for healthcare Covered Entities, as well as a hardened Zimbra system used by a domestic Drug Task Force with international responsibilities.

Upon founding Mission Critical Email, Mr. Stone architected and deployed the company’s Zimbra multi-server hosting environment on Amazon Web Services, and was invited by Zimbra to present on AWS Hosting Best Practices at Zimbra’s 2018 North American Partners’ Conference in Texas.

Over the years, Mr. Stone has refined a series of Zimbra best practices that go well beyond Zimbra’s default configurations, and his frequently updated technical Zimbra blog posts score thousands of hits each month.

At Mission Critical Email, our goal is to provide our customers with Zimbra systems that are performant, reliable, secure and cost-effective — systems that meet each customer’s Mission Critical Email needs.