>If you're upgrading a W10 machine to the Anniversary edition, here's some of what you can expect:
>
>1. Initial installation via Updates: once you set it in motion it runs in the background. Doesn't use much CPU but it hammers your Internet connection while it downloads the update (about 20 minutes in my case at 15Mbps), other Internet activity such as web browsing is extremely slow
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>2. It requires a restart. Once you do that, it takes about 35 minutes, with several restarts, to get back to the logon screen (OS on an HD - OS on an SSD will likely be quicker)
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>3. After you log on there is another 5 minutes of "setting up" before you get your desktop (again, SSD might be quicker)
>
>4. Cortana is re-enabled if you previously had it disabled. There is no longer any straightforward way in the Start Menu or Settings to disable it. You must use either Group Policy (Pro or higher) or a registry hack in the Home version: http://www.windowscentral.com/you-can-disable-cortana-windows-10
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>5. Apps pinned to the Taskbar: File Explorer, Microsoft Edge, Microsoft Store. You will need to un-pin them again if you removed them earlier
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>6. A number of new apps installed without permission. The most egregious is Candy Crush, right-click on it in the Start Menu to uninstall
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>7. You must go through your Privacy settings again, there are more than before in more categories. Things that are turned on by default:
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>- General: Let apps on my other devices open apps and continue experiences on this device
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>- Notifications: Let apps access my notifications is turned on by default (I don't know if this is new)
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>- Contacts: Let apps access my contacts is now Enabled by default. I'm pretty sure it was there before and if so I had it turned off, so MS has ignored my prior wishes with this
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>- Other devices: Let your apps automatically share and sync info with wireless devices that don't explicitly pair with your PC, tablet or phone - this is enabled by default (and new I believe)
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>- Background apps: Let apps run in the background - a lot are now enabled by default even if you previously had them all turned off. I don't know if the ones enabled by default are all new or not (they may be)
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>Settings: Update and Security - go into Update Settings...Advanced options.
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>- If you previously instructed Win10 to get updates for other MS products when you update Windows, this has now been disabled by default. You must re-enable "Give me updates for other Microsoft products when I update Windows"
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>On that screen go into "Choose how updates are delivered":
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>- If you previously disabled "Updates from more than one place", this has been re-enabled by default, and you will need to disable it again
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>Browsers/Personalized Ads:
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>- To disable your ear tags used for personalized advertising, you must go to http://choice.microsoft.com/en-us/opt-out in each browser you use and opt out. For FireFox, IE and Edge you get this additional message:
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>"To opt out of personalized ads in this browser, your browser history must allow first-party and third-party cookies and you must have your browsing experience set to NOT delete browsing history on exit. Instructions for enabling cookies and configuring your browsing history may be available in your browsers settings, privacy, or help documentation."
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>As of September 15 MS has updated its Privacy Policy, you can read it at https://privacy.microsoft.com/en-gb/privacystatement .
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>Settings...Personalization:
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>- Lock screen...Background gets changed to "Windows Spotlight". This shows changing pictures, "suggestions" and apparently some people get advertising on that setting. If you had it set to something other than "Windows Spotlight" you will need to reset it. "Picture" is the same as the default for the earlier version of Win10. Make sure the other settings on that page are the way you want them
>
>Main takeaways:
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>1. The Anniversary update takes some time. If you have the chance, install the update and then choose to shut down and restart (rather than just shut down), with the restart happening at some time when you don't need to use the computer (e.g. at lunch or the end of the work day). If you just choose to shut down, and then expect to be able to restart your computer and use it right away, you're SOL, you have a considerable wait
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>2. After your first log on in the new edition there is a 5 minute wait before you get your desktop
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>3. If you want to re-disable Cortana and reset your system back to a somewhat privacy-respecting (as far as anyone knows) configuration, you will need to go through the above. In my case it took another 25 minutes in total
>
>This list of changes in Anniversary Edition is probably not complete. If anyone knows of other changes, please contribute.

UPDATE: another thing that happens during the Anniversary installation is that any sites you had configured in IE Compatibility View get blown away - you will need to re-enter them.