The European Commission launched an investigation into the matter in July last year.
European Union (EU) regulators are planning to fine Microsoft by the end of this month for the company's failure to provide users with a choice of Internet browsers.
EU's antitrust arm, the European Commission (EC), launched an investigation into the matter in July last year.
Citing unnamed sources familiar with the matter, Reuters said that the EC is planning to fine Microsoft before the Easter break and the size of the fine could be significant.
In 2009, the EU signed an agreement with Microsoft to give Windows users additional options with regards to Internet browsers.
According to the EU, if Microsoft was found guilty of violating the agreement signed in 2009, it would have to pay fines up to 10% of its turnover.
In October last year, EU warned Microsoft to modify the Internet Explorer Web browser on its latest Windows 8 operating system to avoid further antitrust investigations.
Microsoft was earlier fined $2.17bn in EU antitrust investigations that included an €899m penalty for not complying with the court's order to share data with its rivals.