Microsoft 365 (Exchange Online) is the world's most widely used business email and office solution, offering 50GB mailboxes, 1TB OneDrive storage, and deep integration with Word, Excel, and Teams — the benchmark choice for enterprise productivity.
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Google Workspace offers professional business email with custom domain support, 30GB+ storage, and deep integration with Google Docs, Meet, and Calendar. Gmail has over 1.8 billion active users, making it the world's most popular email service.
FastMail, founded in 1999 in Melbourne, Australia, is a veteran premium email service. Its proprietary JMAP protocol delivers real-time unified sync for email, calendar, and contacts, known for custom domains, privacy, and low-latency performance.
Zimbra is an open-source enterprise collaboration and email platform offering mail, calendar, contacts, and file sharing groupware features.
Cron is a next-generation professional calendar app, later acquired by Notion and evolved into Notion Calendar, supporting deep Google Calendar sync, multi-timezone views, and team scheduling.
Amplenote is an all-in-one notes, tasks, and calendar productivity tool known for nested tags and bullet journal style, with a free tier and paid plans around $8/month, ideal for time-focused knowledge workers.
Outlook.com (formerly Hotmail) is Microsoft's free personal email service, founded in 1996 with 400M+ active users. Deeply integrated with the Microsoft 365 ecosystem for email, calendar, contacts, and cloud storage.
Yandex 360 is Yandex's all-in-one business collaboration platform, offering custom domain email, cloud storage, document editing, and video conferencing—the leading Google Workspace alternative in Russia and the CIS.
Titan Email is a Newfold Digital (formerly Endurance International Group) brand offering custom domain business email hosting with calendar, contacts, and team collaboration features for SMBs.
Zoho Mail was founded in 2008 and is headquartered in Chennai, India. It is one of the most cost-effective business email services, offering a free plan with 5 users/5GB storage, paid plans from $1/user/month, and a clean ad-free interface with deep Zoho ecosystem integration.