Original sentence: Windows XP has had many security issues; as of February 2005, there have been two service packs released to address security problems with Windows XP
Edited sentence: Because of these security problems, many users have switched to alternative software such as the FireFox browser or Netscape, which are considered more secure and safe than Microsoft Internet Explorer, and also usually have many more features (and are easily customise).Linux is also starting to expand its user base, with many switching to get away from the slightly aging (released in 2001) XP.Windows XP has had many security issues; as of June 2005, there have been two service packs released to address security problems with Windows XP