comma usage

[sharanbr]

In most of the books on puncutation, I have read that after or before a direct reference to a person, a comma should be placed. E.g:

Thanks, Michael
Michael, thanks

But I have seen some cases where people dont put comma, as in the following case:
Thanks Julie, you solved my problem

Can anyone clarify?

Regards

 

[Anglika]

It is the modern tendency to carelessness and slackness. Use the comma if you prefer.

 

[sharanbr]

It is the modern tendency to carelessness and slackness. Use the comma if you prefer.

Thanks. I was thinking that there are exceptions to the rule.