Change default value on a choice column

To get a choice column with multiple selections to allow default values with multiple selections a calculated value is needed.

Note that this is mostly used in a Foundation environment where Terms are not allowed.

In the Default value field give formula: =";#Offer;#Deal;#" where Offer and Deal is valid column choices.

References:

http://sharepoint.stackexchange.com/questions/8281/is-it-possible-to-set-multiple-default-values-for-a-checkbox