Fix issue with too many contacts in iPhone caused by Outlook Suggested Contacts. How to disable them from syncing.

I had a client the other day that wonder why he was seeing so many unrecognized contacts on his new iPhone.  I had a quick look at it and it certainly showed many more contacts than are listed as contacts in Outlook.   I immediately thought of the "Suggested Contacts" list that Outlook automatically creates - it builds a list of other people that you've sent mail to or received mail from but haven't necessarily saved to your official contacts lists.  So I went into his Suggested Contacts list in his contacts area of Outlook and that list did appear to be the source of all of the extraneous contacts on his phone.

Luckily, starting with iOS 6, I believe, there is an easy way to prevent this Suggested Contacts list from syncing from Outlook/Exchange to your iPhone or iPad.

On your iPhone, follow these steps...

1. Open the Contacts app  (or go to Phone app and then switch to Contacts area).
2. Click the "Groups" button in the upper left corner of the screen.
3. You'll see a list of different contact groups so you want to un-check the "Suggested Contacts" group. 
4. Click "Done"!

Now it may take a few minutes for everything to sync again but this will remove all of the Suggested Contacts from the iPhone, leaving you with just your actual list of contacts from Outlook.