well with around 7/8 it will at somepoint crash,never had one that doesnt
but a bit of good housekeeping doesn't go amiss
1. once everyday make everyone save and exit
2.then check in the"who has this workbook open"-delete any that are still in there except you and un-share then re-share
that should help it work nicely

if despite this the workbook starts to play up at any point ,stop all users entering data, tell them to save as.a local copy and then exit the workbook. do steps 1 and 2 then get them to re-enter any missing data from their saved copy
sometimes none of this works and the thing just crashes if it does youll find in the same folder a file or files with a name like abd2c.tmp or similar you can try renaming it and opening
also read here
http://office.microsoft.com/en-gb/ex...001013057.aspx