How 15GB partition is enough?

Hi all,

I am ready for installing a Windows Server 2003, I plan it will install Excahge 2003, SQL 2000/2005, ISA Server 2004 … do a 15GB partiton is enough for it??

Of couse, all of the FTP, IIS, Mail, Database Date will not save it C:, will have the other 15GB partition for them

My HDD is total 30GB old IDE IBM…

And I want to ask, do SQL 2000/2005 and Excahgne 2003 can install in C:, but setting the E-Mail and Database Date save in D: (15GB), if yes, how to, where can find the document of how to setting it up like this??

I am new in System Admin, just my company is small, and now I am be my company’s only one IT support staff, my company plan build a windows base platform … and it is my find job ….

Can anyone suggestion what I much learn and find more learning resource that can help me do this first job??

Thx