OFC 07 wrkbk saved short date format changes to general when reop
 

We have a shared workbook that is saved in 03 format although we are using
Office 2007. We have two columns that are formatted as short date, then
saved. However upon reopening it reverts to General. What is the problem?
We highlight colum and choose short date, then save in 03 format.

We save in 03 format b/c one person has not upgraded to Office 07.

Please give feedback.