Go to Settings > Apps > Apps & features to change whether you're shown app recommendations when trying to install apps from outside the Store.

Enable and disable your touchscreen in Windows. Windows 10. In the search box on the taskbar, type device manager, then select Device Manager. Select the arrow next to Human Interface Devices and then select HID-compliant touch screen. (There may be more than one listed.)

It is easier to assign a retention policy on a per-folder basis instead of individually to each message. However, even when a retention policy is assigned to a folder, you can select one or multiple messages, and then assign a different policy to only those messages.