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I recently uninstalled Office 2016 64 bit due to incompatibility with other software and installed Office 32 bit. However, now Windows 10 isn't recognising any default mail app.

For example: Right click file → Send to → Mail Recipient returns the following error:

Either there is no default mail client or the current mail client cannot fulfill the messaging request. Please run Microsoft Outlook and set it as the default mail client.

Outlook Error:

Outlook Error

Examining Control Panel, you can see on the LHS that the "Mail" option is somewhat unavailable. Selecting it results in Application Not Found

Control Panel & Explorer.exe Error:

Control Panel & Explorer.Exe Error

This painfully means I can't perform functions such as scan to email, or bundle up a file directly into outlook.

Steps I've taken in fixing this issue include:

  1. Removing registry keys from old install

  2. Uninstall and re-install

  3. Removal of Gsuite GSync

  4. Attempt to re-install 64 bit

  5. System restore

  6. Check default protocols

  7. Check default programs

  8. Check default apps

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