Messenger

All are great products, but Slack's standard version costs roughly 4x the cost of Officetree Messenger (assuming monthly billing) and their best version is priced at roughly 5x the cost of Officetree Messenger!  If you don't need features such as Slack's Active Directory synchronization with Okta, then try Officetree Messenger and save your hard-earned money.  Meanwhile, Skype has a great personal messaging tool but it's not designed for business teams, and Skype for Business is great for periodic meetings but it doesn't offer some of the daily messaging features (e.g. team channels) offered by Slack or Officetree Messenger.

We provide an app for everyone so all users can stay connected!  We have desktop apps for Windows and Mac PCs, and mobile apps for iOS and Android phones.  We also offer a browser-based application that works at any resolution.  All portions of the Messenger application are designed to work from hotels, behind corporate firewalls, from home, via wireless internet connections, etc.  so that business users have regular access to chat with co-workers and business contacts.  The Windows, Mac and Web applications can be left open on a user’s machine in a small window mode so co-workers can reach each other regularly throughout a day, all using the same corporate messaging client.