Well, I'll try it out in a few workbooks and scenarios and see how it behaves in 2010. So far, using the formula "=!$A$1:INDEX(!$A:$A,COUNTA(!$A:$A)) " in a named range called "Test", then using "=Counta(Test)", updates fine when I fill down the column.
Also, this appears to work fine:
When I add sheets, both of the above continue to function fine.
If you have any other resources commenting on the behavior of ![Ref], I would love to see them. In the mean time, I will use it where I feel appropriate, or can anticipate a likely use, and report back with any issues I have.
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