Fix Outlook Security Certificate Error

[Abhilash Dogra]

If Outlook suddenly shows a security warning and stops sending or receiving emails, it can be confusing and frustrating. This article explains why you might see an Outlook Security Certificate Error, such as mismatched certificate names, expired certificates, or incorrect server settings. When this error has already affected your mailbox file and made it inaccessible, simply fixing the certificate might not be enough. The MSOutlookHelp PST Repair tool can help repair a corrupted PST that's tied up with these issues. It supports both ANSI and Unicode PST files, so older and newer Outlook mailboxes are covered. The tool also preserves your folder structure during repair, keeping things like Inbox, Sent and custom folders organized.