This is due to a setting on your computer. Please follow the below steps to resolve.
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Ensure your outlook app is updated to the most recent version
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Computer Settings
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Click "Apps"
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Click "Default Apps"
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In the Enter a file type or link type, type ".eml"
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Open the option displayed and choose the newest version of the oulook logo.
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This may be challenging to see, so please compare to the image below
- Here is a screen recording of the process https://share.zight.com/5zuq2G2