Microsoft has been beating the Windows 10 drum almost exclusively since that operating system's launch last July, virtually ignoring 10's predecessors. The cumulative roll-up, while certainly a convenience to Windows 7 users, also plays to Microsoft's pitch to upgrade to Windows 10.
Although the Get Windows 10 (GWX) app -- which Microsoft seeded to millions of PCs last year, and has repeatedly refreshed and re-issued to Windows 7 and 8.1 devices since then -- was not listed in the enormous manifest of fixes (download .csv file) included in the roll-up, Microsoft will benefit from a larger number of up-to-date Windows 7 PCs. The more machines with a current Windows 7 configuration, the more that will be able to process a Windows 10 upgrade without significant problems.
The Windows 7 roll-up can be downloaded from the Update Catalog. Again, IE6 or later is required to access the online catalog.
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