OK to install SBS SP1 on top of SP2?

I have an SBS 2003 server that I'm trying to apply the Vista/Office 2007 update to (KB 926505). This errors with "This update cannot be installed. Either it is already installed as part of an existing service pack, or it requires a more recent service pack."

It turns out Server 2003 SP2 was applied to this machine without first installing the superseding SP1. Is it safe to apply the last part of the SBS SP1 update (specifically SBS2003-KB885918-SP1-X86-ENU.EXE) over the top of SP2?
cowpenAsked:
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cowpenAuthor Commented:
Windows Server 2003 SP2 will include everything in Windows Server 2003 SP1, however SBS 2003 SP1 is a separate service pack and is specific to SBS. This must be installed in addition to the Server SP2.

In absence of any guidance on this, I went ahead and installed SBS SP1 over the top of Server 2003 SP2. The install completed as expected, and there were no subsequent issues.

After applying SBS SP1 (KB885918), I was then able to successfully install the SBS Vista / Office 2007 update without errors.
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tomcahillCommented:
sp2 will include everything in SP1.

You won't be able to install it because of that.

You may want to re-install SP2
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D-OveRMinDCommented:
Thank you for taking the plunge and reporting back.  I am about to do the same thing to resolve some SBS specific issues myself.  Luckily, I have it on an ESX server, so I just snapshotted the machine.  :-)
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