99.9% protection from suspicious/spam emails.Accessible from any internet-connected device.And none of these functions costs a dime. Offering a generous 15 GB of free email storage, Gmail does everything it can to make your inbox less chaotic, including advanced filters that automatically push emails into separate folders as they arrive. Unlike other email accounts, you can use your Gmail address to log into and manage your YouTube account, as well as collaborate on shared documents and spreadsheets right from a cloud-based Google Drive. Pro Tip: You can also use a free product like HubSpot Meetings to easily schedule meetings without back-and-forth emails. Like most other email accounts today, Gmail also has an intuitive calendar where you can set meetings and reminders. Google Hangouts, available from your inbox's left sidebar (or the right - you can customize how your inbox is displayed), lets you text and video chat with other Gmail users for the things that might not warrant an email message. Since it’s built into Google Suite, you can also access a group of free apps that allow you to chat, video conference, and share files with the people in your contact list. Gmail is a regular email inbox tool you can access once you have a Google account.

Ironically, one of the reasons Gmail has become so popular is because of all the communication options in your inbox that don't involve email. According to Litmus Labs, Gmail has the second-highest email provider market share (behind Apple iPhone's native email app).

It might seem like an obvious top pick, but Gmail is just too versatile not to get our first slot. Who should use it: Anyone who already uses and loves the rest of Google's products. Unique Feature: Native File Collaboration Sign up here.

Mozilla Thunderbird: Best for Managing Multiple Accounts.

Outlook: Best for Multiple App Integrations.

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