Configuring Itunes to sync with the right Outlook PST file after Office 365 Set-up

A client called me to alert me of the issue he had ever since Office 365 was set-up. The Outlook PST file that was synced to the Iphone is now wrong, with 0 calendar and some weird contacts. As such, I have re-configured the default PST file to sync for Itunes with the steps outlined below:


(taken from my post i submitted here)
Background Info:

• I am using the latest version of Itunes, 11.0.3, and Outlook 2010.
• Iphone 4s using iOS 6.1.3
• I have been using 2 POP accounts and 1 IMAP Account.
• Recently, I have migrated my IMAP account to Office 365.
• To avoid having to re-do all the customization, I decided to simply 'add' an exchange-office 365 profile into my current DEFAULT OUTLOOK PROFILE where all my POP and IMAP accounts are found.

Situation:
 
All is well, until I realized, my default Outlook data file is now switched to the Exchange 2013/2010 OST file side where Office 365 account resides. Now I don't have any calendar or Contacts in that OST file. Therefore when Itunes launched and perform a sync, all my contacts and calendar items were..zapped.


Solution:

1. Untick the sync in Itunes for Outlook. All my contacts and calendar on the phones will be deleted. Better that way since i don't want to end up with duplicates.Just proceed to REMOVE.
2. Note that you need to manually record any new items you've just created on the phone ever since you realized that your contacts and calendars were missing on the phone.
3. Do a sync and check the phone to see that all info are 'GONE'.
4. Closed both outlook 2010 and itunes.
5. Go to Control Panel > Mailbox (32-bit) > Click Show Profile
6. I only had 1 profile, so choose the default profile (usually named OUTLOOK)
7. Click Properties
8. Click Data Files
9. Make sure that the old PST file is ticked. Note that it should currently be the Exchange Office 365 OST file. When I choose my old PST file, it gave me a warning which i noted, and proceed.
10. Note that emails for office 365 will still be delivered to the Office 365 OST file because in Accounts List, the default mail delivery folder (Properties > Accounts > Email Accounts > select the Office 365 acc > you'll see that the New messages will be delivered to the OST file.
11. Proceed to apply, then close everything.
12. IMPT: OPEN OUTLOOK FIRST, this will set the Outlook Data File configuration right with the PST file being the default instead of the Office 365 OST.
13. After Outlook is opened, verify that Calendar and Contacts are there and well.
14. Proceed to open Itunes right after that. It doesn't matter whether Outlook is opened or closed.
15. Go to the Iphone - Info tab, then tick the sync with Outlook for both Calendar and Contacts...

Now you can breathe and relax.