It is not very user friendly.

This morning I found a nice message in my mail box. A snippet of what it contained is below.

Yes 336 messages awaiting my response.  Each with its own little check box spread across 27 distinct pages.  And to quote LinkedIn's help pages "Deleting an item from your 'Inbox' is not an available function." Good grief.  They have a function called archiving but it would require at least 363 clicks to clean out my Inbox. 

I am declaring LinkedIn messaging amnesty. 

Guilt is not a good method to increase use.  LinkedIn needs a mass Inbox delete function or use of a river metaphor to handle messages.