Hand-written Wills are valid under Mississippi law if they meet certain requirements.
A hand-written Will is called a "holographic" Will.
The requirements for a holographic Will are:
(1) the Will must be written completely in the maker’s handwriting; and
(2) the maker of the holographic Will must be 18 years old or older; and
(3) the maker of the holographic Will must be of sound and disposing mind; and
(4) the maker’s signature must be at the end of the Will. Any attempted gifts written below the maker's signature is not considered a part of the Will, and will be disregarded by the Mississippi courts.