Microsoft SPLA, Service Provider Licence Agreement is, as the name suggests, a licensing program aimed at Service Providers. It gives them a very cost effective subscription based licensing model, allowing them to offer monthly pricing to their users.
Come January 1st 2011, there are going to be some changes to the Windows Server pricing:
| Product | Price Change |
| Windows Web Svr | -21% |
| Windows Svr Std | -21% |
| Windows Svr Ent | -21% |
| Windows Svr Datacenter | +30% |
Why is Windows DataCenter going up? Well, it’s actually going DOWN, as the current price is technically a promo that’s been going on for about 2 years 
For more info and some FAQ’s, head to:
Cloudy with a chance of Licensing 