Microsoft now giving away VS 2013

[MachineCode via Digitalmars-d]

On Thursday, 13 November 2014 at 00:58:41 UTC, Walter Bright 
wrote:
> http://techcrunch.com/2014/11/12/microsoft-makes-visual-studio-free-for-small-teams/
>
> This is good news for D! It lowers the bar for writing 64 bit D 
> code on Windows, and it also enables us to abandon support for 
> versions of VS prior to 2013.

I don't use neither VS for D nor dmd 64-bit compiler but Mono-D + 
dmd 32-bit instead of. Whay does means

> enables us to abandon support for versions of VS prior to 2013

? why should you be supporting it before?