Microsoft Exchange Server 2003 and Windows Server 2003 Service Pack 1 will not be supported any longer. These products have reached the end of their lifecycle on 4/14/2009.

This is very simple, find store.exe file.
Click right mouse button on file store.exe and choose ??oPropertise???
Click ??oVersion??? and for ??oOther version information??? choose ??oComments???
For Exchange Server 2003 default installation is in folder C:\Program Files\Exchsrvr\bin

For Exchange Server 2007 default installation is in folder C:\Program Files\Microsoft\Exchange Server\bin

Personal Folder Files (.pst files) over a local area network it’s not a good idea. All operations take longer. Write operations can take approximately four times longer than read operations. Outlook has slower performance than the Exchange Client.

When you install Exchange 2000 Server or Exchange Server 2003 on a domain controller remember that: – the domain controller must not be a node in a server cluster (Microsoft do not support Exchange 2000 Server clusters or Exchange Server 2003 clusters that are configured on Active Directory domain controllers) – the installation of [...]

The Exchange Calendar Update Tool enables administrators to avoid the challenges involved with broadly deploying the Outlook tool to all users and ensuring that each user runs the tool correctly. On August 8, 2005, the United States Congress passed and President George W. Bush signed into law the Energy Policy Act of 2005. Among other [...]

When we can use Exchange System Manager and when we can use Active Directory Users and Computers for manage Exchange Server 2003? We use Exchange System Manager to manage Exchange organization, manage servers, move all mailboxes from one server to another server, create public folders. We can use Active Directory Users and Computers to managem [...]

Differences Between Exchange Server 2003 and Exchange Server 2007 New features in Exchange Server 2007: – open proxy detection to help prevent Denial of Service (DOS) and spam attacks – edge transport service resilience for inbound SMTP message receipt rate control – enables high availability – dynamic analysis of sender reputation – Microsoft Office Outlook [...]

Differences Between Microsoft Exchange Server 2003 Standard Edition and Microsoft Exchange Server 2003 Enterprise Edition.
Exchange 2003 Enterprise Edition supports up to four storage groups, with each storage group having up to five databases. Exchange 2003 Standard Edition supports only one storage group and that storage group can only contain two databases.
Exchange 2003 Enterprise [...]

Exchange Server 2003 Service Pack 2 (SP2) adds improved mobile e-mail capabilities, larger storage in Standard Edition (limit to 75 GB), better protection from spam (Sender-ID support, anti-phishing filtering), enhanced security, advanced mailbox fundamentals. download SP2 for Exchange Server 2003 and trial it…

Step 1. Verify that the NNTP, SMTP, WWW and ASP.NET services are installed and enabled on the server. (see How to enable NNTP service and SMTP service)
Step 2. Install Windows 2003 version of the Windows Support Tools. (download Windows Support Tools)
Step 3. Run DCDiag to test network connectivity and DNS resolution. Review the [...]