Outlook add email account: requested operation failed

This can happen if there is a crash during the account setup process. The data file gets created first and then an email account doesn't get associated before the crash (or you force outlook to close etc.) happens.

You need to use the Registry Editor to fix this problem.

1. Close Outlook.

2. Open the Registry Editor to the following key:

   Computer\HKEY_CURRENT_USER\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook

   You will notice there are a bunch of entries with hex values for names, however two of them have sub values. One of them only has calendar summary (so not this one) and the other has a list of entries named "0000001", "0000002" etc.

3. Click each one in turn - you will notice one of the values it contains is "Account Name". Double-click that value and you will see a readable text version of the entry on the right hand side of the pop-up.
4. Find the one that has no text and delete it.
5. Close the Registry Editor and restart Outlook.

If none of that made any sense to you, get help and don't try it by yourself...

• In Outlook, go to Tools > Options > Mail Setup > Email Accounts
• Select your already configured first email account and choose Change.
• Select Change then More Settings.
• Go to Advanced (Open these addtional mailboxes) and add the other mailbox.