Google "batch tutorial".

You're welcome.

powershell or batch.
>command line
same as batch

check this out for command reference
http://ss64.com/

This is literally one line. Two if you have brain problems.

mkdir -p "path/to/john smith/correspondence"; mv *.msg $_

>>53659674
>>53659777
Use perl or python. these guys are stuck in the last century

>>53660606
Why introduce dependencies for something this simple?

>>53660825
Because batch is toxic and not worth learning past basic commands. Also learning a scripting language will be beneficial

>>53659642
I know you

Powershell is pretty great for stuff like this. I use it for sysadmin stuff everyday. It's natively installed on any modern Windows system, way more flexible then batch, on top of having easier syntax.