Exchange Server 5.5 Service Pack 4 (SP4) is a cumulative release that contains all of the updates to Exchange Server 5.5. For an overview or to order SP4 on CD, see the Exchange Server 5.5 SP4 Downloads Overview page. To download SP4, follow the instructions on this page.

Important: Be sure to make and verify a complete backup of your server running Exchange Server 5.5 before installing this service pack. The service pack cannot be uninstalled.

To download and install SP4:

  1. Create a folder named SP4 on your local hard drive.

  2. Download all of the compressed files listed in the table on this page to the SP4 folder. The files are separated to speed download time.

  3. At the Microsoft Windows NT command prompt, switch to the SP4 folder, type the name of a compressed file, and then press ENTER to display the self-extracting dialog box.

  4. In the Unzip To Folder box, type the location of the SP4 folder. Click the Unzip button. Once the self-extraction process is complete, click OK, and then click Close.

Note: The files on this page are only for x86-based computers. If you need the files for Alpha-based servers, call (800) 360-7561 to order your SP4 CD Kit.





Core Server Netsetup

22.6 MB
1 hr 50 min @ 28.8 Kbps


Support Directory, except Symbols

25.8 MB
2 hr 2 min @ 28.8 Kbps



11.8 MB
57 min @ 28.8 Kbps


Chat Server

16.3 MB
1 hr 18 min @ 28.8 Kbps



7 MB
34 min @ 28.8 Kbps


Calendar Connector, GroupWise Connector, and Notes Connector

16.9 MB
1 hr 22 min @ 28.8 Kbps


IBM Professional Office System (PROFS) Connector and SNA Distribution Services (SNADS) Connector

15.8 MB
1 hr 17 min @ 28.8 Kbps


Symbols for all connectors in Exchange Connector 1 and Exchange Connector 2

3.5 MB
17 min @ 28.8 Kbps


Forms Converter

3.5 MB
17 min @ 28.8 Kbps


MSOUTL (Microsoft Schedule+ Driver for Microsoft Outlook) and Address Book Templates

15 MB
1 hr 13 min @ 28.8 Kbps


Win16 clients for I386 (Languages: Brazilian, Simplified Chinese, Traditional Chinese, Czech, Danish, Dutch, English, Finnish, French, German, Greek, Hungarian)

18.3 MB
1 hr 29 min @ 28.8 Kbps


Win16 clients for i386 (Languages: Italian, Japanese, Korean, Norweigan, Polish, Portuguese, Russian, Spanish, Swedish, Turkish)

16.8 MB
1 hr 21 min @ 28.8 Kbps


Outlook Web Access Client Language Packs

14.2 MB
1 hr 9 min @ 28.8 Kbps