What are the cheapest licenses for Windows Server (current) which I can legally run

Question

1) A Web server

2) A Server running MySQL

Please list any technical limitations, if you know them (e.g. max memory).

Thank you

Answer 1

1: Windows Server Web Edition under SPLA - about 15 USD per month.

2: the same ;)

Technical limitations - I assume you are smart enough to find micrsoft's website and there the website of Windows.