Is this track officially released by a major label?

No, this track was self-released by Dido and is listed as "Not On Label."

What format is the Dido – Thank You (Acoustic) available in?

It is available as a digital MP3 file.

This version was released in 2013.

Name: Dido – Thank You (Acoustic) (File, MP3)
Brand: Dido

Pop

What Thank You (Acoustic) by Dido is worth on the used market.

Label · Not On Label (Dido Self-released)Format · File, MP3Genre · Pop

Used

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New / Sealed

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Thank You (Acoustic) by Dido (2013) on File, MP3. The Discogs marketplace floor is null with 0 copies currently for sale.

Pressing, country, and condition (media + sleeve) move vinyl/CD values the most — first pressings and clean copies command a premium.

Is this track officially released by a major label?: No, this track was self-released by Dido and is listed as "Not On Label."
What format is the Dido – Thank You (Acoustic) available in?: It is available as a digital MP3 file.
When was this specific version of the song released?: This version was released in 2013.