The Outlook Android app occasionally tries to fetch new emails but is unable to do so. It's possible that this is due to server downtime. Server failures are fairly prevalent these days because all apps rely on the cloud. These minor server failures are usually quickly resolved, so you won't lose any emails.

A software bug is a fault or malfunction in an application that results in undesired or inaccurate outcomes. It's a fault in an app that stops it from working properly, which is why software updates are so important. All of these enhancements are aimed at making the user experience better. While regular update reminders might be annoying, especially if you have a lot of apps, they can improve your overall experience and ensure that you get the most out of your devices over time.