As a mac user in a company that runs primarily windows, after searching for .msg viewers, trying a few online converters, downloading a few of the “dat viewers” here in the store that didn’t show me any msg content, I went ahead and pulled the trigger on this paid app (knowing it's possible to request a refund from Apple if it didn’t work effectively). Worked instantly showing exact content of msg files and all marketed features work for me. It will support my particular needs and am grateful there’s a reasonably priced option here to mitigate the steps of seeing the file content. Only recommendation I’d have for the developer is to replace the toolbar button icons with something more modern, reflective of Apple’s evolving aethetic. The present icons (in version 1.9.6) look like clipart and it lessens the perceived quality of the app itself.