Office 365 E1 Plus (No Teams) is a cloud-based enterprise service from Microsoft that offers a suite of web-based applications and business services for unlimited users. Customer needs to buy Microsoft Teams separately.  This product combines the features of Intune Plan 1 and Entra ID Plan 1 for zero trust security on top of the features of Office 365 E1. 
 
Key Features of Office 365 E1:
Web-Based Microsoft 365 Apps: Access Outlook, Word, Excel, PowerPoint, and OneNote to create, share, and collaborate from wherever you are.
Email and Calendars via Microsoft Exchange: Get secure and reliable business-class email with a 50 GB mailbox per user.
Microsoft 365 for Mobile: Get Microsoft 365 apps on iOS, Android, and Windows devices with screen sizes of 10.9” or less.
OneDrive for Business: Access 1 TB of personal cloud storage from anywhere, on any device.
SharePoint Online Plan 1: Share and manage content, knowledge, and apps with 1 TB of OneDrive storage per user.
Microsoft Stream: Upload, organize, and share intelligent video content companywide.
Microsoft Forms: Easily create surveys, quizzes, and polls.
Power Apps for Microsoft 365: Build the business apps you need and extend or customize the apps you already use.
Power Automate for Microsoft 365: Make repetitive tasks easy with workflow automation.

Key Features of Intune Plan 1:
Microsoft Intune Plan 1 is a cloud-based unified endpoint management solution designed to help organizations manage and secure their devices and applications. It offers cross-platform endpoint management, built-in endpoint security, mobile application management, and endpoint analytics. Intune Plan 1 supports a wide range of devices, including Windows, Mac, iOS, Android, and Linux, making it a versatile solution for managing diverse technology environments. Additionally, it integrates with other Microsoft services like Microsoft Defender for Endpoint and Azure Active Directory, providing a comprehensive security and management solution for both company-owned and bring-your-own devices. 
 
Key Features of Entra ID P1: 
Microsoft Entra ID Plan 1 (formerly known as Azure Active Directory Plan 1) is a cloud-based identity and access management solution designed to help organizations manage user identities and secure access to resources. It offers features such as single sign-on (SSO), multifactor authentication (MFA), conditional access policies, and dynamic group management. Entra ID Plan 1 also includes advanced security capabilities like identity protection and risk-based access control, which help protect against identity compromise. Additionally, it integrates seamlessly with other Microsoft services like Microsoft 365 and Azure, providing a comprehensive and secure identity management solution for both cloud and on-premises environments.
 
Buy Office 365 E1 Plus which includes enterprise-level, web-based apps such as Excel and Outlook, integrated with cloud services such as OneDrive that enable productivity from anywhere and security proucts like Intune P1 and Entra ID P1. It provides the “core” cloud business functionality addressing the need for security and compliance.