I would imagine that most company has got a similar life cycle like 'end of life' and 'end of interactive support' for their outdated products.
EOIS - End Of Interactive Support
This means that Intel will no longer provide interactive support for these products via telephone, email or chat. Technical support will continue to be available via the web. Intel will maintain information for these motherboards on our Support Site.
If the board is still under warranty please see the Warranty Information Page for repair information.
EOL - End Of Life
EOL is self explanatory. The product is discontinued. But if you bought the brand new intel products, you will still have your 3 year warranty, starting from the date of purchase.
What do you mean by Board D975XBX2 does not support PATA and SATA simultaneously.
Please see TPS page 25/106
All the best,