
Definitely not Ariel. Look at the 1s—the bend in the serif is less obvious in Arial’s case compared to Helvetica.Personally I think it may be some form of Microsoft's alternative to Helvetica
The Arial typeface you see when you view this forum is not the forum’s copy of Ariel; it is the local machine’s copy of Arial that’s being used. This forum does not seem to transmit any font resources.[…] Arial we actually have a version available on the forum