Thunderbird Portable as Default Mail Client (Integration) Here is the best and easy solution to make ThunderbirdPortable as Default Mail Client...
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Create a subfolder in your ThunderbirdPortable folder (for example: "..\ThunderbirdPortable\Windows")
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Change to the created subfolder to create the following batch-file...
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Create a batch-file (for example: "Thunderbird Portable Integration.bat")
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Run created batch-file !
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Default-Mail-Client must be set manually !
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First in ThunderbirdPortable (Options/Settings)
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Then in your Windows-Settings (Default-Apps)
Original Reference (By Neddenien): https://portableapps.com/node/65088