MUID on by164w.bay164.mail.live.com
About this cookie:
This cookie is widely used my Microsoft as a unique user identifier. It can be set by embedded microsoft scripts. Widely believed to sync across many different Microsoft domains, allowing user tracking.
There is no specific information about this cookie from this host provider. If you have any information about how this cookie is used by this host, please get in touch.
About this cookie’s host: This domain is owned by Atlas Solutions which is in turn owned by Facebook. Atlas is an online advertising business, targeting users through tracking their web activity. From September 2014 the company re-launched under the ownership of Facebook, promising the ability to reach known users and target adverts based on profiles generated using Facebook's user data.
Related general information about MUID:
These cookies are used to deliver adverts more relevant to you and your interests. They are also used to limit the number of times you see an advertisement as well as help measure the effectiveness of the advertising campaign. They are usually placed by advertising networks with the website operator's permission. They remember that you have visited a website and this information is shared with other organisations such as advertisers. Quite often targeting or advertising cookies will be linked to site functionality provided by the other organisation.More about cookie classifications.
Third Party Cookies
If the host domain for a cookie is different to the one in the browser bar when it was downloaded, then it is a third party cookie.
They are usually placed in a website via scripts or tags added into the web page. Sometimes these scripts will also bring additional functionality to the site, such as enabling content to be shared via social networks.
For example, if you visit a site that has a YouTube video in one of its pages. This has been included by the website owner, using a piece of code provided by YouTube. YouTube will then be able to set cookies through this code, and know that you have watched that video, or even just visited the page the video is in.
Online advertising is the most common use of third party cookies. By adding their tags to a page, which may or may not display adverts, advertisers can track a user (or their device) across many of the websites they visit.
This allows them to build up a 'behavioural profile' of the user, which can then be used to target them with online ads based around their 'calculated' interests.
Analytics cookies are probably the most common form of persistent cookies in use today.