Any suggestions for an instant messaging service to use for my small biz to replace Google Talk?

[iMore Question]

I received an email that google talking would be going away and I would need to choose another. All of my 19 office computers are pc based. Any suggestions? [redacted]

 

[Just_Me_D]

Re: I am looking for an instant messaging service to use for my small business to replace Google Tal

Skype
Asana
Slack

to name a few.