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Introduction

MSNP4 is the third released version of the Mobile Status Notification Protocol. It was introduced officially in Client Version 2.1.1047.

Command information

No commands for any service were known to be introduced in this version

No error codes were known to be introduced in this version

No commands were known to be removed in this version

Known changes

(from MSNP3):

?
?
?
Honestly, we don't know.
New fields in initial profile, probably. Don't know why else, not sure why it required it's own protocol version. (none are parsed by the client either)
Client 2.2.1053 according to whatsnew.asp has Kids Passport support. Probably a new initial profile field by then. (Client doesn't parse 923 yet either)

Client-server communication example

C: VER 1 MSNP4 MSNP3 CVR0
S: VER 1 MSNP4
C: INF 2
S: INF 2 MD5
C: USR 3 MD5 I example@hotmail.com
S: XFR 3 NS 10.0.0.5:1863 0

Client disconnects from server

Client opens a connection to 10.0.0.5:1863

C: VER 4 MSNP4 MSNP3 CVR0
S: VER 4 MSNP4
C: INF 5
S: INF 5 MD5
C: USR 6 MD5 I example@hotmail.com
S: USR 6 MDS S prefix
C: USR 7 MD5 S $md5(prefix + password)
S: USR 7 OK example@hotmail.com example%20user
S: MSG Hotmail Hotmail 367
MIME-Version: 1.0
Content-Type: text/x-msmsgsprofile; charset=UTF-8
LoginTime: 1726321960
EmailEnabled: 1
MemberIdHigh: 1
MemberIdLow: 2
lang_preference: 1033
PreferredEmail: example@hotmail.com
country: US
PostalCode: 
Gender: 
Kid: 0
Age: 
BDayPre: 
Birthday: 
Wallet: 
Flags: 1027
sid: 507
kv: 11
MSPAuth: AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA$$

C: SYN 8 5
S: SYN 8 5
C: CHG 9 NLN
S: CHG 9 NLN
C: OUT