Before moving on with the solutions to fix Windows 10 Mail app, check if rebooting your system and router solves the issue. Some users reported that using the escape, ctrl, or up/down arrow keys after the search results are shown, stops mails from disappearing.
Solution 1: Update Windows of Your System and the Windows 10 Mail App to the Latest Build
Microsoft updates Windows and Microsoft Store Apps regularly to satiate the ever-evolving technological advancements and patch the reported bugs (like the one causing the issue). In this context, updating the Windows of your system and Mail app to the latest build may solve the problem.
Solution 2: Change Mail Box Sync Settings
The search issue could be a result of a communication glitch between the mail server and your system as many users reported the issue with the mails available on the online server. In this case, changing your mailbox sync settings to anytime will download all the emails to your system and then can easily be searched in the Mail app. If the issue is still there, then you can use a web browser to search the email provider’s website for the emails. You can also try another mail client application (like Outlook, Mozilla Thunderbird, etc.). Some users reported that performing a clean installation by using the ISO of the latest version of Windows 10 (for example 20H2 at the time of writing this article) resolved the issue.
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