Service pack 4 Exchange Server

Generally, unless there is an ample reason to install this service pack, I wouldn't even install it, it could cause problems as opposed to fixing them.

If you are having a specific problem with your exchange server and the documentation of SP4 for Exchange details a fix to that problem, then you should install. Otherwise, I advise subscribing to the "If it ain't broke, don't fix it" theory.

You should definitely install SP2 for Exchange, but there is no need to move further unless you are having a problem.

This is from the site - most of them you can ignore - have a look through and see what you need.

SP4_550I.exe
Core Server Netsetup 22.6 MB

SP4_55SS1.exe
Support Directory, except Symbols 25.8 MB

SP4S550I.exe
Symbols 11.8 MB

SP4_55CI.exe
Chat Server 16.3 MB

SP4_55DC.exe
Documents 7 MB

SP4_55Xconn1I.exe
Calendar Connector, GroupWise Connector, and Notes Connector 16.9 MB

SP4_55Xconn2I.exe
IBM Professional Office System (PROFS) Connector and SNA Distribution Services (SNADS) Connector 15.8 MB

SP4S55Xconn.exe
Symbols for all connectors in Exchange Connector 1 and Exchange Connector 2 3.5 MB

SP4_55FO.exe
Forms Converter 3.5 MB

SP4_55client1I.exe
MSOUTL (Microsoft Schedule+ Driver for MicrosoftOutlook?) and Address Book Templates 15 MB

SP4_55client2I.exe
Win16 clients for I386 (Languages: Brazilian, Simplified Chinese, Traditional Chinese, Czech, Danish, Dutch, English, Finnish, French, German, Greek, Hungarian) 18.3 MB

SP4_55client3I.exe
Win16 clients for i386 (Languages: Italian, Japanese, Korean, Norweigan, Polish, Portuguese, Russian, Spanish, Swedish, Turkish) 16.8 MB

SP4_55langI.exe
Outlook Web Access Client Language Packs 14.2 MB

I usually subscribe to if "it ain't broke, don't fix it". However, Microsoft recommends installing this.

Would I be safe if I only install the first of these compressed files, the one called Core Setup?

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