An AutoFilter dropdown list will only show 1000 entries. If your column
has more than 1000 unique items, they can be filtered, but they can't
all be displayed in the dropdown list.

To AutoFilter for an item that doesn't appear in the dropdown list, you
can choose Custom from the dropdown list, and type the criteria. Also,
there are a couple of workarounds he

http://www.contextures.com/xlautofilter02.html#Limits

sp8 wrote:
The problem here is that if the column being sorted is more than 1000 cells
long then it does not recognise beyond line 1000.
How can I resolve this?


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Debra Dalgleish
Contextures
http://www.contextures.com/tiptech.html