Traditionally, the service provided each patch in its own proprietary archive file. Occasionally, Microsoft released service packs which bundled all updates released over the course of years for a certain product. Starting with Windows 10, however, all patches are delivered in cumulative packages. On 15 August 2016, Microsoft announced that effective October 2016, all future patches to Windows 7 and 8.1 would become cumulative as with Windows 10. The ability to download and install individual updates would be removed as existing updates are transitioned to this model. This has resulted in increasing download sizes of each monthly update. An analysis done by Computerworld determined that the download size for Windows 7 x64 has increased from 119.4MB in October 2016 to 203MB in October 2017. Initially, Microsoft was very vague about specific changes within each cumulative update package. However, since early 2016, Microsoft has begun releasing more detailed information on the specific changes.