To enable cookies in Thunderbird, follow these steps:
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Go to Options. The location of Options depends on your operating system:
- Windows: Click the menu button (three horizontal lines) > Options > Options.
- macOS: Click Thunderbird in the menu bar > Preferences.
- Linux: Click Edit > Preferences
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Select the Privacy & Security panel.
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Under the Web Content section, find the "Accept cookies from sites" setting. Ensure this is selected (checked).
By enabling cookies, you will be able to use OAuth 2 for authentication, which is necessary for accessing services like Microsoft 365 email in Thunderbird. Keep in mind that Thunderbird only provides access to Microsoft 365 email; calendar and tasks are not supported.
