Microsoft Windows NT 4.0 Guide Uživatelský manuál stáhnout pdf (Strana 132)

Microsoft

Windows Server

™

2003 White Paper

Windows NT 4.0 Server Upgrade Guide 127

deliver faster and consistent client performance without the expense of

equipping remote offices with additional servers to run Exchange.

§ Outlook 2003 cache mode. Because Outlook 2003 operates primarily on its

own cached copy of a user's mailbox, fewer requests are made to the server,

reducing the server load per user and enabling more users to be supported

per server.

Security A number of important improvements have been made to increase the security of

the Exchange system across several different fronts. Like Windows Server 2003,

the default settings of Exchange Server 2003 for all system variables are selected

to maximize system security.

§ OWA now uses cookie authentication and connection time-out processes to

help eliminate the likelihood of security breaches through unattended

browsers. Additionally, OWA supports the use of the S/MIME security protocol

to send e-mail messages.

§ VSAPI, the virus-scanning API, has been improved to give administrators

more deployment options. New junk e-mail message management capabilities

help prevent unsolicited messages with support for connection filtering based

on real-time blacklists, inbound recipient filtering, and beacon-blocking. In

addition, VSAPI antivirus software can now run on Exchange gateway and

bridgehead servers as well as mail servers.

§ Support for Internet Protocol security (IPSec) for managing front-end and

back-end servers.

§ By adding Windows Server 2003, remote procedure calls (RPC) over HTTPS

tunneling securely connect Outlook 2003 clients with Exchange Server 2003

without the need for a VPN.

Upgrading to Exchange Server 2000

Although many arguments favor an upgrade path that leads from Exchange 5.5 directly to

Exchange 2003, an organization may want to consider upgrading to Exchange 2000 first.

One reason is that current Exchange 5.5 servers cannot be upgraded using the in-place upgrade

method, whereby an existing server is upgraded directly to Exchange 2003. Only Exchange 2000

servers can be upgraded directly to Exchange 2003. However, in-place upgrades of Exchange

servers can be problematic. Even a small corruption in the Exchange stores (databases) can

disrupt the upgrade process. When very large Exchange stores are involved, the chance of failure

increases. For organizations with large information stores in particular, an in-place upgrade would

probably prove risky.

A less risky upgrade path involves the movement of mailboxes from one version of Exchange to

another version of Exchange. Although more time-consuming than an in-place upgrade, this

method tends to less invasive and so less risky.

Operating System Versions

Another consideration for organizations is the underlying operating system. Exchange Server

2003 runs on either Windows 2000 with SP3 or Windows Server 2003. However, to take

maximum advantage of its features, Windows Server 2003 is required. For example, the new

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