Confusion – What is a Cumulative Update vs. an Infrastructure Update vs.a Service Pack


David Ducolon on the Microsoft Office 2007 Project blog posted an article entitled Confusion – what is a CU or an IU versus a SP??? I put the following together to help me and our system administrators better understand the difference between a CU, IU, and SP.

Microsoft recently began releasing Cumulative Updates (CU) and Infrastructure Updates (IU) in addition to Service Packs (SP). CUs and IUs are currently focused on Microsoft Windows SharePoint Services and Microsoft Office infrastructure products such as Microsoft Office SharePoint Server (MOSS), Project Server 2007, and PerformancePoint.

A CU is a grouped set of Hotfixes. When a CU releases, customers will only be given the patch if they already have an open service request that is fixed with the CU or if they specifically request the Hotfix patch.

A SP is a roll-up of Hotfixes with some strategic improvements from the engineering team.

An IU is not just bug fixes but also core changes to the product with highly anticipated customer experience improvements. The IU was a hybrid of the above. An IU patch can contain changes to Infrastructure code that other applications rely upon. For more information on the recent IUs, see,, and

I think I got it right.


Steve Mullen has been involved in information technology for over 35 years. He is also actively involved in the music program (voice and English hand bells) and Vestry of St. Anne’s Episcopal Church in Damascus, MD.

Posted in Microsoft, Microsoft Office, Microsoft Project, MOSS, SharePoint
One comment on “Confusion – What is a Cumulative Update vs. an Infrastructure Update vs.a Service Pack
  1. I always spent my half an hour to read this webpage’s posts everyday along with a mug of coffee.

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