The IM Presence Macro shows when a given user is online in a selected chat service. The macro only supports a small number of chat services, and we feel that most modern chat tools provide better ways to see this information.
We ended support for the IM Presence macro in Confluence 7.0, and hid it from the macro browser. Any existing instances of this macro will still work, but you won't be able to insert this macro into the editor using the macro browser.
End of support means Atlassian will not fix bugs related to this macro in Confluence 7.0 or later versions.
To check whether a macro is used in your site, go to General Configuration > Macro Usage.