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Cumulative updates, Service Packs and Public Updates in SharePoint

Service Pack:
It’s an update or combination of previous updates helps to make our product more reliable. It includes new fixes, functionality additions and all fixed that released previously (means Previous Service packs, Cumulative updates). That means if MS people released a service pack recently means that contains all the list of features up to date.

Service packs will not be multilingual. We have to download and install separate service packs for each installed language. We must install service packs for specific product as soon as possible. Microsoft provides all the latest fixes and updates in Service pack. There are no prerequisites for Service pack installations because each service pack includes all the recent updates from product release. Service Packs will not release frequently.

Cumulative Update (CU):
Cumulative update is collection of all the hot-fixes up to date. Generally Office hot fixes are released for every two months in a package. It includes fixes for all the issues collected from hot-fix accepted criteria that related to customer impact or reproducible.

Cumulative update also includes critical on-demand hot fixes and security updates. It includes all the previous cumulative updates and public updates from previous service pack release. Cumulative updates are multilingual. It includes fixes for all languages. To install CU in our machine,, we have to install recent service pack related to that product (If released).

Generally cumulative updates are not mandatory to install. We can install them to fix any issue. While downloading CU itself we can see the applicable scenarios in KB article page. There is lot of chances to affect the system. So we have to check before installation or advised by Microsoft people support to install. Cumulative updates releases frequently for a second month like (Feb, April, June, Aug, Oct, Dec)

Public Update and Critical On Demand:
Public update includes product fixes that applicable to large number of customers. Public update also applies for multilingual. To install public update we have to install most recent service pack if released. Sometimes Public Updates may have prerequisites for Cumulative updates also.  Public Update includes security fixes and it is recommended to install ASAP.

Critical On Demand will applicable for less number of customers facing critical problem. It will applicable for a specific problem or issue. COD is not multilingual. We have install COD’s on Microsoft people recommendations only.

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