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Re:Slack may regret its letter to Microsoft by JamesBarney on Thursday November 03, 2016 @04:46PM (#12867781)
Stack overflow benefits from tremendous network effects while Slack does not.
Re:Slack may regret its letter to Microsoft by mdonahoe on Friday November 04, 2016 @05:56PM (#12876490)
Slack has some limited network effects with guest access, but they should really make inter-company collaboration easier.

The lock-in due to loss of history is a bigger reason to stick with slack though once you have it.