One of the most frequent issues encountered by Outlook Express Users is the MAPI error. This error usually occurs while trying to export files or mails from Outlook Express to some other mailing client such as MS Outlook.
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To do so, follow these steps:
Restart your computer, and then start Outlook Express.
On the Tools menu, click Options.
On the General tab, click to clear (un-check) the Make Outlook Express my default Simple MAPI client check box, and then click Apply.
Click OK when you receive the prompt to restart your computer.
Regards,
James