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I have a bbc micro bit. It has a ARM Cortex M0 chip that supports BLE. enter image description here

I want to be able to send messages via Bluetooth to this usb dongle (with only Bluetooth 2.0 support). Will I be able to send messages back and forth to the bbc micro bit with this usb dongle. Or is it the case that the bbc micro only supports BLE?

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It does NOT support classic Bluetooth (v2). It is running a Nordic nRF51822 SOC, which can ONLY run BLE v4.1 full in central/peripheral/combined mode... as well as their proprietary radio waveforms such as ESB and Gazelle.

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From Wikipedia on BLE/Bluetooth Smart:

Bluetooth Smart is not backward-compatible with the previous (often called "Classic") Bluetooth protocol.

Thus, no, you would not be able to communicate with a Bluetooth 2.0 dongle. Doing so with a BLE-compatible device would require the device implement Bluetooth 4.0 with both the 'normal' Bluetooth and BLE portions of the standard.

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