
There are some pretty big disclaimers for this. The page count may or may not represent the actual number of indexed pages – these numbers often change with the datacenter you hit, and they’re always approximations, and often, they’re vastly off-target (and a search engine may also artificially inflate the number).
Furthermore, a bigger index size does not indicate a “better” search engine; as a hypothetical example, search engine ABC may index 100,000 unique pages containing a certain phrase, whereas search engine XYZ indexes 500,000 duplicate spam pages containing that phrase... so even when, in this example, ABC has a much lower page count, it may still provide a better search result.
With that in mind, here are the page count results for “copyright 2007” – as you can see, Yahoo returns the highest page counts, followed by Google, then MSN, and finally Ask (when the count is falling, not rising, it’s likely that I just hit a datacenter with older numbers):

And in comparison, these are the page count results for “copyright 2006” in the same time span:

Download the Excel data file with all page counts [XLS].
Feel free to share everything you see here, as usual.
[Thanks Alek!]
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