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aviamsi's avatar
aviamsi
Copper Contributor
Dec 13, 2018
Solved

Microsoft Outlook User-Agent string ?!?

Hello everyone,

 

First post here 🙂

 

I ran into the user-agent string below and was wondering where it came from.

Is it somehow related to Office365? 

It would be very helpful to know which application will generate such a UA and in which scenario.

 

Sample UA:

Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 10.0; WOW64; Trident/7.0; .NET4.0C; .NET4.0E; .NET CLR 2.0.50727; .NET CLR 3.0.30729; .NET CLR 3.5.30729; Microsoft Outlook 16.0.9126; Microsoft Outlook 16.0.9126; ms-office; MSOffice 16)

 

Thanks,

Avi.

  • Not sure what you mean exactly, are you looking at your website logs and seeing the user agent string there? If so, it's most likely because of RSS subscription that someone has configure via Outlook. Or maybe Outlook fetching an image or other file attached to an email, which is hosted on your site.

4 Replies

  • It's Outlook :) You see all the additional "browser" strings there because Outlook communicates with the server via the MAPI/HTTP protocol.

    • aviamsi's avatar
      aviamsi
      Copper Contributor
      Thanks for the prompt response!!
      Could you describe the scenario in which this UA will be generated?
      I am trying to figure out the scenario here.

      For example, I have an email which part of its content includes a URL to my website.
      When I click the link, it opens Chrome and my site loads.
      Looking at the logs I do not see the Outlook section in the UA string, but the default Chrome UA.

      Thanks again,
      Avi.
      • Not sure what you mean exactly, are you looking at your website logs and seeing the user agent string there? If so, it's most likely because of RSS subscription that someone has configure via Outlook. Or maybe Outlook fetching an image or other file attached to an email, which is hosted on your site.

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