Slack wouldn’t comment on whether it’s seen increased usership or any issues with increased demand, citing a quiet period around its upcoming earnings. Zoom wouldn’t comment specifically on growth in usership, but Zoom CFO Kelly Steckelberg told Yahoo Finance on Monday, “At the end of January if you took the run rate of our minutes usage at that point, we were on a run rate of a hundred billion annual meeting minutes and that is up pretty significantly since then.” Last week, their chat volume on Microsoft Teams was up 50 percent, while video and audio meetings were up 37 percent compared with a week earlier. Usage rose in the United States as well, at least among Microsoft employees, many of whom have been instructed to work from home. Microsoft’s Teams saw a 500 percent increase in meetings, calls, and conference usage in China since the end of January, according to a spokesperson.