What is the call breakdown of a typical desktop/PC support helpdesk globally?
ie windows, internet, outlook, etc

I can answer only for a couple of operations I have been involved in.
Taking a sample of 10,000 calls, the most common element (42%) was
connectivity problems, which includes both dial-up and networking
problems.

Of the remainder, Outlook was the most commonly mentioned specific
application, followed by "browser problem" (sorry, no stats on which
browser but IE is probably the majority.

The calls which ate up the most time per call were security/virus
calls which includes problems in setup or maintenance of antivirus
software.

Looking at hardare, displays get the highest number of calls, followed by keyboads.