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1.6.3 Deploying Service Packs and Hotfixes
Between operating system version releases, Microsoft releases regular updates to correct bugs and security
vulnerabilities. These updates are distributed in two basic forms:
• Service Packs, which are packages that contain a large number of updates; and
• Hotfixes, which are small, incremental updates released between service packs.
A service pack contains all of the updates for an operating system over a period of time, and all the updates
found in previously released hotfixes. Service packs are eventually rolled into the distribution of the
operating system and become a stable part of the operating system. Fixes in service packs continue to work
as you uninstall and reinstall other components, unless you uninstall the service pack. Hotfixes, on the other
hand, can be overridden by the installation of new software. Thus, if you install a hotfix and then later
update a component affected by the hotfix, you will need to reinstall the hotfix.
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