FAQs / Exchange 2003 / Outlook 2003

01

Client

• Outlook 2003, Windows XP with Service Pack 1 + Q331320

Server-side

• Exchange 2003 on Windows 2003 for FE (if FE is deployed)
• Exchange 2003 on Windows 2003 for BE
• Exchange 2003 on Windows 2003 for Public Folders
• Exchange 2003 on Windows 2003 for System Folders
• Windows 2003 for Global Catalog server

When used with the Microsoft Windows Server 2003 RPC Proxy Service and Exchange 2003, Outlook 2003 clients can connect simply using HTTP or HTTPS, thereby reducing the need for virtual private networks (VPNs) or dial-up remote access. If remote users only need to gain access to corporate messaging information, your IT department may not need to deploy VPN infrastructure. VPN-less access reduces costs and provides for increased security by ensuring that remote Outlook users don’t need access to the entire network.

Last Updated by Simpler-Webb on 8/7/2003 1:59:40 PM (QID #1060)
Categories: Exchange 2003/Setup/Upgrade | Exchange 2003/Outlook 2003 |

02

Yes. Windows XP with Service Pack 1 + Q331320

Last Updated by Simpler-Webb on 8/7/2003 1:59:40 PM (QID #1125)
Categories: Exchange 2003/Outlook 2003 |

03

• "Registry Modification Required to Allow Write Operations to Schema" - KB216060
• "Setting an Attribute's searchFlags Property to Be Indexed for ANR" - KB243311.

Last Updated by Simpler-Webb on 8/7/2003 1:59:40 PM (QID #1126)
Categories: Exchange 2003/Outlook 2003 |

04

The following tables illustrate how RPC compression and buffer packing works on the wire between the Outlook client and Exchange Server.

Outlook 2002 against Exchange 2000 / 2003

Mode	Data Flow	Network Client	Buffer Size	Data Buffer Size	Size on Wire	Compressed
Online	Download/Upload	LAN	32Kb	32Kb	32Kb	No
Online	Download/Upload	WAN	4Kb/8Kb	4Kb/8Kb	4Kb/8Kb	No
Offline	Download/Upload	All	32Kb	32Kb	32Kb	No

Outlook 2003 against Exchange 2003

Mode	Data Flow	Network Client	Buffer Size	Data Buffer Size	Size on Wire	Compressed
Online	Download	All	32Kb	32Kb	<32Kb	Yes
Online	Upload	All	32Kb	32Kb	<32Kb	Yes
Cached	Download	All	96Kb	>96Kb	96Kb	Yes
Cached	Upload	All	32Kb	32Kb	<32Kb	Yes
Offline	Download	All	32Kb	>32Kb	32Kb	Yes
Offline	Upload	All	32Kb	32Kb	<32Kb	Yes

The compression technology used between Outlook 2003 and Exchange 2003 is called XPRESS(tm) and is based on the Lempel-Ziv (LZ-77) algorithm. This is the same technology that Active Directory uses to perform compression of its’ RPC data when replicating between servers. All data over the size of 1 KB is compressed, and the technology is built into both client and server; therefore the compression is full duplex.

The compression gain is dictated by the message format and attachment(s) type. Because the compression is performed at the RPC level, all message data is compressed.

• Plain text and HTML messages usually compress between 60% and 80% (on the wire saving)
• Rich-text (RTF) messages usually compress up to 20% (on the wire saving)
• Word documents compress down better than PowerPoint files

Last Updated by Simpler-Webb on 8/7/2003 1:59:40 PM (QID #1127)
Categories: Exchange 2003/Outlook 2003 |