You can update service packs and hotfix packs.
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A service pack is a collection of updates released on a periodic basis to resolve software issues and to enhance software performance. Each service pack contains a cumulative set of hotfixes that were released after the previous service pack version. A new service packs is available every 90 days.
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A hotfix pack is a collection of hotfixes that are targeted at resolving specific critical issues that might cause major disruptions to operations or potential loss of data. A new hotfix pack is available every week.
For more information, see Service Packs and Hotfixes.