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Lots of questions! I'll see how much I can clarify for you.
1) In general, yes, you can replace a RAID controller without losing data. However, it has to use the same firmware stack. SRCS16 and SRCSATAWB do *not* use the same firmware stack.
2) You cannot install the SRCSATAWB on an SE7210TP1. See http://www.intel.com/support/motherboards/server/se7210tp1-e/sb/CS-009920.htm - only RAID cards that came out around the same time as the board, are supported.
3) If you need to stick with that motherboard, check the THOL for other cards that do support bigger HDs, or go for an external SAN.
Turns out this motherboard doesn't support any RAID cards that can handle more than 500Gb. Can't afford a SAN's solution. Will NAS work? Can I use the Seagate BlackArmor NAS 220 or 420 as the data storage unit for Exchange 2003? Can you recommend another NAS?
Thanks so much!
Yes, NAS should work. Once you move the storage off the local hardware, and start pushing it across the network, the SE7210TP1 no longer has any effect. At that point, it's all up to the OS - any onboard Intel network port will work fine for that.