Microsoft claimed on Monday that MSN Messenger was the most popular instant messaging (IM) service in 11 countries, including the UK, during March 2003.
The company also boasted that its IM offering has reached a record high of 100 million global active users per month.
Microsoft pointed to research from Nielsen//NetRatings which rated MSN Messenger as the top free IM service in the UK, Australia, France, Germany, Italy, Japan, The Netherlands, Spain, Sweden and Switzerland during March.
"MSN Messenger has proven to be a powerful communication service for consumers worldwide," said Lisa Gurry, group product manager for MSN.
"MSN delivers innovative technology, such as Shared Browsing with MSN Messenger, and it will raise the bar further with exciting new services when we unveil our next version this summer."
Microsoft added that, over the coming months, it will roll out a version of the service that delivers advanced personalisation, integrated games and video chatting capabilities, along with a revamped user interface. Further details can be found here.
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