See this Google Groups question on importing an ODS file from a backup if you're in that situation but you're not sure how to get the messages out of the file.
Hụ ajụjụ otu Group Google na ịbịpụta faịlụ ODS site na nkwado ndabere ma ọ bụrụ na ị nọ n'ọnọdụ ahụ mana ị maghị otu esi enweta ozi sitere na faịlụ ahụ.