Note the mandate is just "for the sole purpose of video conferencing". That is, they're not replacing slack. Just, I think, what they used before/currently, is

Note the mandate is just "for the sole purpose of video conferencing". That is, they're not replacing slack. Just, I think, what they used before/currently, is zoom. This came up on an earlier HN thread when MS/Github leadership was already telegraphing that. I think github uses some significant "slack ops" integrations, so even if leadership would like to move off that too, it would probably be a lot harder and take longer and require some development/ops work.