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Exchange 2000 vs 2003

Last Modified: 2012-05-12
I'm in the process of planning to install Exchange 2003 standard on a new box and then decommission Exch2000 (about 10yrs old box).  However, before doing so, management wants to know what are the benefits of Exch2003 over 2000.  I know some of you would already think why are we still in Exch2000...long story.
As far as I know, these are the differences and if you can point our more or correct me, pls do so.

1.  Exch2003 have better looking and working OWA
2.  Exch2003 can be "published" to the internet. Meaning, I can configure my Outlook to "talk" directly with our Exchange server from home without VPN.
3.  Exch2003 supports Outlook 2007 and 2010
4.  Exch2003 database size can be up to 75GB compared with only 16GB size in Exch2000
5.  Exch2003 supports e-mail push technology. Meaning, e-mails can be sync with smartphones.
6.  Exch2000 is no longer supported by MS.

Three things I'm not certain.
1.  Does Exch2003 supports public folders just like in 2000?  
2.  Do we need to purchase the "email push technology" in Exch2003 to work or is it built in?
3.  We only have about 100 or less mailboxes. Can we run the new hardware server with raided SATA drives and not SCSI?  Just don't want a performance hit.
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