Booting from ISO

I have a Dell PowerEdge 2850 running Window Server 2003.  I am required to upgrade this server to Windows Server 2008 R2 Standard Edition, in order to be able to backup my Exchange 2010 server, using Backup Exec. This server has a CD-ROM.  I have downloaded an ISO image from eOpen.Microsoft. Using Roxio, I was able to split the image into 5 CDs.  Each image is an ISO file.  (Unfortunately, we no longer have a Systems Administrator, and I drew the short straw).  Question 1.) Can I boot from a ISO or do I have to unpack it somehow before burning it to CD.  If question 1 is yes, I can boot from the ISO on CDs then, Question 2.) How do I get the server to boot from it.  The server does not prompt me to press the space bar to boot from CD, as it does for desktop and laptop computers.
a1785Asked:
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Adam BrownSr Solutions ArchitectCommented:
Probably better to boot from a DVD, but if you can get a hold of a 4+ GB Jump Drive, you should be able to boot and install from that. I don't know if the Windows 2008 Install truly supports multiple disks. You might have a lot of problems if you try to install using 5 CDs.
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cwstad2Commented:
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nobusCommented:
i also suggest to change the cd into a DVD drive -easy, and low cost (under 25 $)
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a1785Author Commented:
This is what I have done.  I also, through this process have a better understanding of how ISOs work.  Thanks.
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