When Outlook shows a certificate warning, it can stop you from sending or receiving emails and leave you confused about what went wrong. Here are common causes like mismatched certificates, incorrect settings, or expired digital IDs. In some cases, this problem can also damage the data file behind the scenes. A repair tool like the
MSOutlookHelp PST Repair Tool can help fix the
Outlook Certificate Error by repairing a corrupted or broken PST file so Outlook can read it correctly again. It supports both small and large PST files and keeps the original folder hierarchy intact, so your inbox, sent items, and custom folders stay organized. The tool also preserves attachments and message details like sender and date during repair.
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