New Client running NAV 2.5 Need to Get Up to Speed Fast

I picked up a client that wants to move their Navision 2.5 to better server and add shopping cart but they cannot afford to upgrade. I need to get up to speed on this product as I have never dealt with this platform and am having trouble finding info on older version. Any direction would be helpful. Books Site Manuals anything!

NAV2.5 is quite old and no more supported by Microsoft.

Having said that I believe upgrading to latest version is the best option, you should find out the costs involved in upgrade. Are they paying Annual fees to microsoft? If yes, then I think license for new version will not cost them anything.

If you want to learn the product, then there are books (mentioned on this website also and material from Microsoft customer source).

PS: Welcome to Dynamics User Group.