What the red dot in the right upper side of IM circle icon- in the business skype - means?

Visitor

When I chat with my colleague, I occasionally find a red dot in 'IM' icon.

Please tell me what this red dot in the right upper side of IM circle icon- in the business skype - means.

I've attached a screenshot.

im_reddot2.jpg

 

 

Thanks.

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