1. Changed the opening paragraph in the section "Problems with proprietary videoconferencing systems" as discussed in the mailing list.

2. Added a few more references such as, on Microsoft Teams and verge.
3. Added features of BigBlueButton for education. 
4. Mention of Chiguru server moved to education section
5. Removed the line "Or else ask teachers to post
the pertinent visual materials so that students can get them before
the class, and they can record the audio themselves" because Zoom does not support joining audio calls via ordinary phone from India. 

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