Experiencing the sudden disappearance of emails from your Outlook inbox can be a disconcerting situation. To tackle this issue manually, begin by checking your Deleted Items and Junk Email folders, as emails may have been inadvertently moved there. If that doesn't yield results, consider using the "Recover Deleted Items" feature. However, bear in mind that this method has limitations, particularly for emails deleted a while ago.

Furthermore, ensure your Outlook is not in Offline mode, as this can sometimes hide emails. While manual methods are worth a shot, there's an alternative that offers more comprehensive solutions – the Cigati Outlook PST Repair Tool. This specialized software not only recovers lost emails but also repairs corrupted PST files. It provides a reliable and efficient option, even for severely damaged Outlook data files. Additionally, it includes email migration capabilities, making it a one-stop solution for all your Outlook-related issues.