The collection of diffs between platforms. Note that the symbols on the Microsoft servers are wrong for some modules from NT4 and its service packs, which produces slightly faulty diffs for that platform. These are XML files and use XSLT to render the pages, depending on the size of the file and your browser they may take a while to fully display.
Win95
RTM to SP1
SP1 to OSR-2
OSR-2 To OSR-2 with USB Supplement
OSR-2 with USB Supplement to OSR 2.5
Win98
First Edition to Second Edition
Second Edition to Windows ME
NT3.1
RTM to SP3
NT3.5
RTM to SP3
NT3.51
RTM to SP2
SP2 to SP3
SP3 to SP4
SP4 to SP5
SP5 to NT4 RTM
NT4
RTM (SP1) to SP2
SP2 to SP3
SP3 to SP4
SP4 to SP5
SP5 to SP6a
2000
RTM to SP1
SP1 to SP2
SP2 to SP3
SP3 to SP4
Neptune
2000 RTM to Neptune 5.50.5111.1
XP
RTM to SP1a
SP1a to SP2
SP3 to SP3
Server 2003
RTM to SP1
SP1 to SP2
Vista
RTM to SP1
SP1 to SP2
Server 2008
RTM (SP1) to SP2