iCloud uses Windows Azure Services for Hosting Data: Sources

The wizards at  InfiniteApple, a recently-established Apple-related blog have found out that Apple’s iCloud online services actually use third-party services, namely Amazon Cloud Services and Windows Azure.

It turns out that iCloud seems to use Windows Azure and Amazon Cloud Services for storage, as shown by a packet dump. Below we’re quoting some of the juicy parts:

PUT https://mssat000001.blob.core.windows.net:443/cnt/1234.5678 HTTP/1.1
Host: mssat000001.blob.core.windows.net:443

HTTP/1.1 201 Created
Content-MD5: [redacted]
Last-Modified: [redacted]
ETag: [redacted]
Server:  Windows-Azure-Blob/1.0  Microsoft-HTTPAPI/2.0
x-ms-request-id: [redacted]
x-ms-version: 2009-09-19
Date: [redacted]
Connection: close
Content-Length: 0


While we’re no network experts, it’s pretty clear to make out that iCloud is using third-parties to store most data, including images, as explained by  InfiniteApple.

The dump above only shows references to Windows Azure, although the service contacts Amazon Cloud Services in a number of instances.


Microsoft and Apple have worked together in the past. Back in 1997, when Steve Jobs returned to the then-struggling company, he struck a deal with Microsoft for the Redmond company to develop software for the Mac platform, in order to revive it. Back in 2008, Apple worked with Microsoft again to bring Exchange, a centralized e-mail and contacts service used by many companies, to the iPhone, in order to appeal to business customers, which were lacking at the time.

Having such a reputable company as a customer was probably one of Microsoft’s dreams when it created Azure. With data centers all over the world, Microsoft will now have the opportunity to power a service like iCloud and pride itself in the technological advancements of Azure; while Apple can proud itself in the user base iCloud might one day get. I believe it’s a win-win for both companies.

Via Redmond Pie


How much of this is true, we don’t know, but what we know is there is No Smoke with fire. 😉

Dhawal D

2 thoughts on “iCloud uses Windows Azure Services for Hosting Data: Sources

  1. You can’t get that information from a “packet dump” without having the Azure service certificate private key.  I call BS on your “detection method”.

    • They perhaps, must be having the the details when they tried the test, you can get more info at the InfiniteApple Blog 

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