Looking for a complete solution for single sign-on and mobile device management for Microsoft apps and other services too? The Enterprise Mobility Suite gives you a comprehensive solution for iOS, Android, Windows, Windows 10, and over 2,500 popular SaaS apps.

Because the dogfood build is not publicly available within the app store, users must download the app from Microsoft in order to install it. Since the release of iOS 9, Apple has added some additional security measures that help prevent malicious apps from being installed onto a user's device.

Microsoft and Windows components are signed by leaf certificates mainly issued by six Microsoft Issuing CAs. Beginning in July 2025, these 15-year Issuing CAs begin to expire according to the following schedule.

One solution for protecting message content is Secure/Multipurpose Internet Mail Extension (S/MIME). Mobile messaging applications like Outlook for iOS and Android work in conjunction with S/MIME to sign and encrypt Microsoft 365 message data.

When you sign a signature line, you add a visible representation of your signature and a digital signature. In the file, right-click the signature line and choose Sign.

You can modify your email signature or create a new one to include links to your Facebook or X (formerly Twitter) profiles. To get started, make sure you save copies of the Facebook and X (formerly Twitter) icons to your computer.

Easily view and manage your apps in one list and understand how to update them from several locations in Teams. Citizen developers can also publish an app internally or collaborate with the IT admin.

Anyone can copy an email signature, which essentially is a customizable closing salutation. But a digitally signed message can come only from the owner of the digital ID used to sign it.

We are working on an update to the Mac and iOS applications to support signing in by using an alternative user identifier. To resolve this issue, update to the latest version of Mac and iOS apps.

The cross-signing program is deprecated and new signing certificates will not be issued. Windows will continue to trust the existing binaries signed by the cross-signing program.