I have been testing the semi-public releases of Vista SP1 since late September. Today I downloaded what is supposed to be the final RC1 build on the way to a RTW in Feburary I would guess. I noticed quite a large size decrease from the first preview bulid to the Pre-RC1 and now Rc1 builds. Hopefully it was removal of debug code and not other fixes or features.
9/17/07 - 687 MB
11/8/07 - 434 MB
11/30/07 - 436 MB
1/2/08 - 436 MB
1/19/08 - 434 MB (Final)
Just for comparison here is Windows XP SP3 beta sizes.
9/1/2007 - 334 MB
10/30/2007 - 336 MB
12/27/2007 - 311 MB
1/26/2008 - 315 MB
4/14/2008 - 316 MB (Final)
These are all for the English language versions.
Update (1/25/2008): I fixed some of the dates above based upon the digital signature dates on the original files. Those dates are when MSFT actually built the file rather than when they were released. I also added the RC Refresh 2 for each of them which were just released to testers even though the dates are a bit older. Hopefully the final versions will be out very soon.
Update (2/8/2008): I added the final SP1 installer.
Update (4/25/2008): I added the final SP3 installer.
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