Sorry Max. That did not work.
That's not what you wanted, that is <g>
Ok, so it's "Comments" that we're talking about.
Chuck's suggestion should have worked,
but perhaps you had some implementation problems,
re your feedback to him:
.. I entered comment in first row then
highlighted the whole column and
Excel frooze up on me.
To prevent Excel freezing,
try selecting a *smaller* range to paste the comments
(Do you really need the comments for the entire col - 65k cells?):
Right-click on cell A1 > Insert Comment
Type the comment you want
(That's what Chuck meant by:
"Enter the comment on one cell")
Then right-click on cell A1 > Copy
Select a *smaller* range in col A, say A2:A100
Right-click on the selection,
Choose "Paste special" > Check "Comments" > OK
Repeat the right-click > paste special ..
on the next block of cells (A101:A200, say)