Hi Debi,
This will be our first also. The server we setup is Compaq DL380, 2Gb RAM. The OS or C: drive is 100 gig raid 0+1 an e: drive with 212 gig raid 5. Depending on the document collection you might also want to purchase a DCI server(dedicated content indexer) to increase performance.
Also, you will want to be running Exchange 2000 but it will work with 5.5. With 5.5 though you will run into ActiveX which will slow down your dashboard performance.
That's all I have now, I'll let you know how my install goes next week. Ashley L Rickards
SQL DBA