[jacquesm]

That alone would be a great reason not to use them.

[LaurentVB]

It's also a great reason to use them, isn't it? Your searchable chat history basically becomes the knowledge base of your company.

[gaadd33]

And a great target for discovery in any sort of lawsuit.

[brandon272]

As is email.

[ncza]

To me, that is something that you should keep internal, on internal systems with vetted free software.

[jsmeaton]

https://slack.zendesk.com/hc/en-us/articles/203457187-Settin...

It's configurable for paid accounts, and can be set as low as one day. However, one of the best features of slack (and products like slack) is message history and search. Otherwise, IRC isn't all that different (WRT messaging).

[brackin]

It's why I love Slack. If I remember a conversation about something two months ago I go to the room, search and find exactly what I needed.