Microsoft has been sending "Final Notice" emails to users before they lose access to Outlook on third-party mail apps.
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Microsoft has partnered with Apple on an upcoming iOS update that will migrate Exchange Online accounts using Basic authentication in the Mail app to the more secure Modern authentication (OAuth 2.0).
An update for the ProtonMail Bridge app offers to encrypt and decrypt emails that are stored locally for much quicker access. There's a new Status View and stability improvements as well.
Google is updating its Gmail app for iOS with support for the native Files app. The file picker now lets users navigate and select files through a familiar UI. The feature is currently rolling out.
Apple is releasing the first public betas for iOS 13.4, macOS 10.15.4, and tvOS 13.4. The update brings new emojis, a new toolbar for the Mail app and the much-requested iCloud Folder Sharing feature.
The team behind ProtonMail has released ProtonMail Bridge for Windows and macOS with plans for a Linux release in spring 2018. It allows you to access ProtonMail through a desktop mail client.