However, Word is unavailable, not installed, or is not the same version as Outlook.

The Outlook e-mail editor will be used instead.

An OLE registration error occurred.

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The program is not correctly installed.

Run setup again for the program.

I personally received this warning pop-up when selecting the Send/Receive button.

To have a go at fix this problem, perform the following steps.

You should get a response that says the registration succeeded.

Select OK and try Outlook again.

Thanks to Somajde for this fix.