Let’s look at Windows SharePoint Services 2.0 & SharePoint 2003 major patch releases
WSS 2.0
Sharepoint2003
Release
Version
KB
RTM
11.0.5530.0
N/A
11.0.5704.0
SP1
11.0.6361.0
KB841876
11.0.6715.0
KB841883
SP2
11.0.6568.0
KB887624
11.0.8126.0
KB887623
SP2 Rollup
11.0.8000.0
KB900929
11.0.8126.2
KB898547
Aug DST
11.0.8147.0
KB941412
SP3
11.0.8168.0
KB923644
11.0.8165.0
KB923643
Post SP3 (Feb)
11.0.8168.3
KB941204
Post SP3 (Jan)
11.0.8205.0
KB943167
11.0.8209.0
KB948919
Post SP3 (Mar)
11.0.8210.0
KB950386
Post SP3 (May)
11.0.8219.0
KB952903
SharePoint 2001 Server
Microsoft SharePoint Portal Server 2001 10.145.3941
Microsoft SharePoint Portal Server 2001 with Service Pack 1 10.145.4629
Microsoft SharePoint Portal Server 2001 with Service Pack 2 10.145.6011
Microsoft SharePoint Portal Server 2001 with Service Pack 2a 10.145.6011.5
Microsoft SharePoint Portal Server 2001 with Service Pack 3 10.145.7329
Consolidated article to download and get information about all SharePoint 2001 hotfixes and patches KB312963