One complaint I get all the time (and often make myself) is about the ridiculous folder clutter on the Contacts and Calendar navigation pane when you have multiple email accounts in your profile.
Every account that has it's own data file will have a Contacts and a Suggested Contacts folder. Every Exchange or Hotmail connector account will have it's own Calendar (and often more than one!). Use the LinkedIn or Live Social Connector providers? Add more contacts folders… Use iCloud? Add more… Before you are done setting up a profile, you could easily have 10 or 15 contacts folders (or more!) cluttering up the navigation pane.
Although you can't delete the folders, you can easily hide the ones you don't want to see in a Group. Right click on the My Contacts group and choose New Folder Group. Enter a name for your group then drag the contact folders you don't need to it and collapse it when finished.
Published February 8, 2012. Last updated on April 10, 2013.