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Top Con
•••Mike G's Experience
At $6.67 per user / month (or $8 if billed monthly) , Slack is significantly more expensive than the competition if you need features such as unlimited integrations (more than 10) or unlimited message storage (more than 10,000). However, the free version of Slack includes unlimited users. However if you need only unlimited messages you can use storage services like https://slarck.com to upload then browse and search your entire message history, while staying in Slack's free plan. So with a combo of Slack+Slarck this con is not that major. See More
Notifications are handled separately for mobile and the web app. You can receive notifications for all messages, just direct messages, or based on filters, and you can have different settings for different channels: you don't have to get notified every time someone pushed to GitHub or every time someone posts to off-topic chat, unless you want to. See More
The entire Slack interface is polished and intuitive to use. There are very few bugs or inconsistencies in the UI and it's very fast to use. There is nothing in particular that is new with Slacks implementation of team chat, but the execution of the groups (called channels), search, external service integration and notifications is close to perfect. See More
Although Microsoft is already working on/testing improvements in this area, multi-tenancy using different logins is currently a pain for anyone who has to switch back and forth on a frequent basis. The main problem is it's slow. The app currently cannot store multiple credentials, so it forces you to log out and in again every time. Crossing organizations using the same account could also be improved, but isn't nearly as bad. See More
My own experiences using Teams for messaging and collaboration have been quite good*. I use both the Office 365 Business version and the free version for collaboration outside of work. Teams features chat in topic/project-specific channels, in general channels that can be organization-wide and even private chat which only users you specify can see. Teams video/audio conferencing and screen sharing is also very good. Tabs inside of channels is a powerful feature, allowing Microsoft and third-party tools, including documents, spreadsheets,j other files, calendars, task lists, external websites, internal wikis, etc. to be accessed without leaving Teams. *As of 2019, Microsoft Teams is used by more organizations and has more daily users than previous #1 Slack. An "office messaging apps" list that didn't even include Teams didn't make sense, so I'm adding it now. See More