neowin[.]net/news/edge-119-no-longer-allows-enabling-or-disabling-the-sidebar-if-copilot-is-off/
Edge seems to be broken by design:
Microsoft released Edge 119 in the Stable Channel on November 3, 2023, bringing users several new features, such as Split Screen and sidebar app improvements. However, it also changes the Sidebar setting section: Microsoft quietly moved the toggle for turning the sidebar on or off, causing customers to think you can no longer disable it.Before Microsoft Edge 119, you could turn the sidebar on or off using the "Always Show Sidebar" option on the edge://settings/sidebar page. In Edge 119, the toggle is now situated in the Copilot settings section. Moreover, turning it on or off requires enabling the Show Copilot option. Although you can keep the sidebar and toggle off the Copilot icon, doing so will remove the "Auto-hide Sidebar" option, and the browser will prevent you from turning off the sidebar in settings.
bleepingcomputer[.]com/news/microsoft/microsoft-some-outlookcom-users-cant-send-emails-with-attachments/
In a Monday advisory, Microsoft warned Outlook.com users about issues they might encounter when sending emails containing attachments.Outlook.com users impacted by this known issue are seeing "Error code 550 5.7.520 Message blocked" errors when trying to send emails.
"Some users may not be able to send emails that contain attachments from their Outlook.com mailbox," the company said.
Redmond suggested an alternative method that enables affected users to share files: uploading them to OneDrive and sharing the link with the intended recipients.