Office on the web does not support .msg. In addition, you cannot use Office on the web for custom applications.
You might want to take a look at https://www.independentsoft.de/msg/.
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We would like to preview some test of documents in a webapp developed using .netcore.
QWe can preview xlsx, docx etc. But .msg files are unable to view and showing the result file note found , even those files are in path.
Please assist whether its possible to preview .msg using view.officeapps.live.com
Office on the web does not support .msg. In addition, you cannot use Office on the web for custom applications.
You might want to take a look at https://www.independentsoft.de/msg/.