I use Outlook for most of my emails on my MacBookPro.  I have reached the maximum 128 folders that Outlook evidently permits.  I have a number of folders, both primary and secondary, that I would like to remove completely.  They are no longer needed, and if I can remove them permanently then it opens up space for new folders.  So how do I go about permanently remove old, unnecessary folders?
Hello,
I have multiple mac's (MacPro's, MacBookPro's, MacMini's) all running the latest version of Office 2011 ver14.3.6.

I have 1 mac -  that when Outlook is open our 6mb down and 1mb up connection is completely brought to a crawl.  

A simple ping to 4.2.2.2 runs 8ms-9ms consistently.  When Outlook is opened on the one mac - it ramps up (in 4-7pings) to 400ms-900ms.  

All the Outlook clients here are connecting to Office365 Exchange accounts.  

Even stranger - if I open any of the menu's (top menu bar) the pings instantly return to the normal 8-9ms. Once I click the focus off (back to Outlook) they return almost instantly.

I have completely deleted Office, per the MS KB 2398768.  I then performed a clean install and all updates.  This did not resolve the issue.

Thank you in advance!

-Bart_BJC

Additional Note: Following suggestions on other similar issues I have:
Removed any Folders from inside the Inbox.
Removed all mail from Inbox.