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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):

CVR, SND: Added a client codebase identification parameter.
CVQ has an empty parameter, meant to be the client codebase identification parameter, like CVR has, but is always empty.
Official Client: Client Version 2.2.1053 re-enables the ability to invite people again.

Changes to error codes

Only applies for the Official Client.

Re-added

Where the parenthesis are the last version that had the error.

208 (draft)
500

Removed

None.

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: SND 10 anotheruser@hotmail.com 0x0409 MSMSGS MSMSGS
S: SND 10 OK
C: OUT