In http://technet.microsoft.com/en-us/library/cc262485(v=office.12).aspx?ppud=4, we read "SP3 - Office SharePoint Server 2007 with Service Pack 3 (SP3) is supported on Windows Server 2008 R2 with Service Pack 1 (SP1). However, you must create a slipstreamed installation source for Office SharePoint Server 2007. This installation source must include the files from both Windows SharePoint Services 3.0 with Service Pack 2 (SP2) and Office SharePoint Server 2007 with SP2. " I don't understand the _why_ behind having to install "a slipstreamed installation source". Is this a fundamental requirement for installing all applications on Server 2008? Trying to figure out what I am currently not understanding with regards to the process.

I'm not sure it's a requirement for Windows Server 2008 R2 that all installations must be slipstreamed. In this case, I believe the issue is that MOSS 2007 RTM is not compatible with Windows Server 2008 (MOSS 2007 was released before Windows Server 2008). By including the service pack as part of the installation you avoid any of the (known and fixed) compatibility issues. Making the slipstream is pretty simple. Download the service packs you want to slipstream and extract the files within from the command line with the /extract parameter. Copy the extracted files from both packages into the Updates folder in the SharePoint installation folder (you'll have to copy this from the DVD if you're using the original media or an ISO from VL/TechNet/MSDN). Running setup.exe will automatically install the updates. Todd Klindt has a detailed post about slipstreaming in SharePoint 2010. The process is the same for MOSS 2007 (though the installation packages will obviously differ). Jason Warren Infrastructure Specialist Habaero Consulting Group www.habaneros.com/blog

Hi, I think that it says that for upgrading to SP3 you need to upgrade WSS and MOSS components both. Thanks, Rahul Rashu

Exactly as Jason has stated, you won't be able to install the RTM version of SharePoint 2007 onto your newer server so you'll need to include the Service Packs for both WSS and MOSS in your installation media.Paul Turner http://redmanta.co.uk/blog Twitter: @RedMantaUK MCTS:WSS,MOSS,2010 MCITP:2010. Please remember to click "Propose As Answer" if a post solves your problem or "Vote As Helpful" if it was useful.

I think, this morning, I get it. I can't install older versions of SharePoint 2007 on the new windows os. but there isn't, I assume, a download that has sharepoint 2007 sp3. So I have to build a file that will be used on it. Thank you all for your help.