Android Version Compatibility

To continue receiving updates, use a device with a supported Android version. The minimum supported Android version for Thunderbird for Android and K-9 Mail is generally guided by the versions supported by Google’s Jetpack libraries. Compatibility requirements for each app release are listed below.

Thunderbird for Android

• Thunderbird for Android 17.0 and above: Android 6.0 (Marshmallow, API 23)
• Thunderbird for Android 8.0-16.x: Android 5.0 (Lollipop, API 21)

K-9 Mail

• K-9 Mail 17.0 and above: Android 6.0 (Marshmallow, API 23)
• K-9 Mail 8.0-16.x: Android 5.0 (Lollipop, API 21)
• K-9 Mail 5.700-6.904: Android 5.0 (Lollipop, API 21)
• K-9 Mail 4.9xx-5.600: Android 4.0.3+ (Ice Cream Sandwich MR1, API 15)
• K-9 Mail 4.802-4.8xx: Android 2.2+ (Froyo, API 8)
• K-9 Mail 4.800-4.801: Android 4.4+ (KitKat, API 19)
• K-9 Mail 4.503-4.7xx: Android 2.2+ (Froyo, API 8)
• K-9 Mail 4.501-4.502: Android 2.1+ (Eclair, API 7)
• K-9 Mail 4.393-4.4xx: Android 2.2+ (Froyo, API 8)
• K-9 Mail 4.1xx-4.392: Android 2.1+ (Eclair, API 7)
• K-9 Mail 3.990-4.0xx: Android 1+ (Base, API 3)
• K-9 Mail 3.907-3.913: Android 2.1+ (Eclair, API 7)
• K-9 Mail 3.906 and below: Android 1+ (Base, API 3)