Burst / B series VMs

Hi everyone,

in Cost Management reports I see a line item called “Windows Server Burst” associated with B-Series VMs.

I’ve been trying to understand this for a while, but I haven’t been able to find any official Microsoft documentation that clearly explains what this charge covers.

My assumption is that it refers to the Windows Server license cost for burstable VMs, and not an additional variable charge when the CPU actually goes into burst mode  but I’d like to confirm.

Has anyone found an official Microsoft reference or can provide clarification?

Thanks a lot!