The group messaging app allows users to communicate with people external of their companies without the use of email.
We've said it before,and we'll say it again: Email is outdated, unloved, or probably broken beyond repair. Ami BenDavid agrees. He's developed the messaging app Xros (pronounced "cross") so that anyone can communicate with individuals or groups,in other companies or your own, without using email. Think of it as Slack for freelancers.
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Source: fastcompany.com