> It showed that over the weekend Chrome is the most used browser, while on a weekday, people go back to work and use IE. This has two implications: 1) Companies are still locked into some solutions like OWA and sharepoint because of which users still use IE at work. 2) Users have started distinguishing between browsers and at home they prefer using Chrome.
I think you're overlooking a third possibility: a large percentage of those using IE during the weekdays are people that just use the "default" Windows browser while at work. While at home, they just don't use computers or get online, or at least not near as much as they do while at work.
I wonder if this may be the more likely cause.