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Editorial Team
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Asked: 2026-06-02T01:26:43+00:00

I have a client who experienced problems at our webapp. I have this from

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I have a client who experienced problems at our webapp. I have this from the session:

Browser:    Internet Explorer 9.0
Platform:   Microsoft Windows Vista
User Agent: Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.0; Trident/5.0)
Language:   Danish (da-DK)

So he is using IE 9.0 on Vista, but whats with the Mozilla 5/0 in User Agent? And what is Trident/5.0?

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1 Answer

  1. Editorial Team

    Unfortunately, during the browser wars, many web servers were configured to only send web pages that required advanced features to clients that were identified as some version of Mozilla.

    For this reason, most Web browsers use a User-Agent value as follows: Mozilla/[version] ([system and browser information]) [platform] ([platform details]) [extensions].

    http://en.wikipedia.org/wiki/User_agent

    In other words, virtually all browsers identify themselves as some version of Mozilla to be more compatible with old, ignorant web servers and bad practices.

    Trident is Internet Explorer’s rendering engine.

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