I tried to open my work timesheet with my powerbook Office v.X in 10.3.1 and it doest display correctly. the timesheet is for two weeks starting on a Sunday. For example, 12/4/2003 is one cell. the next cell is (=(cell1Name)+1). This should enter 12/5/2003 into the next cell. These is repeated for the 14 days, so you only update the first Sunday. It opens fine on the windows PC's, but in the Mac Office it shows #### ##### after the third or forth day. Also, will thinkfree, or Org open this file? Its depressing a rather simple .xls has so much trouble. So much for compatibility. (**EDIT**) I downloaded thinkfree, and it opens the file perfectly. So the file is fine on Windows, and Thinkfree, but Office v.X doesnt work. What a pile of crap! Thanks for any help.