If you open MS Outlook and see an error message, Outlook is using an old copy of your Outlook data file (.ost), then use ...
While sending an email through the Outlook desktop app, if you see an error message saying Microsoft Outlook cannot sign or encrypt this message because there are no ...
Maybe try setting Outlook Express as the defauly and then switching it back. If that doesn't work I would probably just reinstall Outlook.
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