You can see if sheet protection is enabled by looking at Tools>Protection.
If "Unprotect Sheet" is available then the sheet is protected but you still
won't know which cells are locked or not.
Note: if the workbook is shared, this method is not valid.
Shared workbooks don't allow sheet protection to be altered.
If you want to see which individual cells are locked or unlocked you need VBA
code.
If you want code, post back.
If you just want to make sure every cell is locked, unprotect the sheet and hit
CTRL + a(twice in 2003)
Format>Cells<Protection. Checkmark "locked"
Then re-protect the sheet.
Gord Dibben MS Excel MVP