Clients and mobile in Exchange Online

Many different clients can be used to access information in an Exchange Online mailbox. These clients include desktop programs such as Microsoft Outlook, Outlook on the web (formerly known as Outlook Web App), and mobile clients such as phones, tablets, and other mobile devices. Each of these clients offers a variety of features.

The following table contains links to topics that will help you learn about and manage some of the clients and client access methods that can be used to access an Office 365 or Microsoft 365 mailbox.

Topic	Description
Outlook for iOS and Android in Exchange Online
Exchange ActiveSync in Exchange Online	Learn about Exchange ActiveSync, the protocol that provides connectivity to a wide variety of mobile phones and tablets. Using Exchange ActiveSync, users can access email, calendar, contact, and task information.
Mobile device mailbox policies in Exchange Online
POP3 and IMAP4	Learn about how you can use the POP3 and IMAP4 protocols to provide users access to a number of the features in their Office 365 or Microsoft 365 mailbox. These client protocols can be used on desktop email applications and on many mobile phones and devices.
Outlook on the web in Exchange Online	Learn about Outlook on the web, which provides users access to their Exchange Online mailbox through a web browser.
MailTips in Exchange Online	Learn about MailTips, the informative messages displayed to users while they're composing a message.
Add-ins for Outlook in Exchange Online
Remote Connectivity Analyzer tests for Exchange Online
Client Access Rules in Exchange Online	Learn how to use Client Access Rules to control connections to Exchange Online.
Disable Basic authentication in Exchange Online	Learn how to disable Basic auth connections to your Exchange Online mailboxes.
Enable or disable modern authentication for Outlook in Exchange Online	Learn how to require Modern auth connections to your Exchange Online mailboxes.