·You import mail from Outlook into Outlook Express, but you removed Outlook from your computer before you tried to import the mail into Outlook Express.
·You configure Outlook Express to be the default Simple Messaging application programming interface (MAPI) client.
·You import or export mail from Outlook Express, and you do not have Outlook installed on your computer.
To resolve this issue, try one of the following methods, as appropriate for your situation.
Method 1: If you want to use a special program you can use Outlook Express Fix Toolbox
https://www.fixtoolbox.com/outlookexpressfix.html
Method 2: Change your MAPI Settings
Configure Outlook Express to not be the default Simple MAPI client before you import the mail items. To do this, follow these steps:
1.Restart your computer, and then start Outlook Express.
2.On the
Toolsmenu, click
Options.
3.On the
Connectiontab, click
Changeto open the
Internet Propertiesdialog box.
4.On the
Programstab, click an e-mail application other than Outlook Express in the
E-maillist. Click
Apply, and then click
OK.
5.Click
OKagain to close the
Optionsdialog box.
6.Exit Outlook Express, and then restart Outlook Express.
You can now import or export messages.
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