IPhone deleting Office 365 exchange email randomly - email threading or sorting

I had reloaded my Office 365 email account onto my iPhone and didn't have anymore problems until this week.. 
I believe that I finally figured out the conflict problem between Office 365 Outlook and iPhone.
Microsoft allows grouping of email chains by subject. Microsoft calls it  "conversations".  On Office 365  I had "conversations on".
Apple to make sure its different calls grouping of emails by subjects "threading". My iPhone had threading off.  I believe that when I downloaded and installed Apple iOS 6 it  reset my mail settings to a default setting of "threading off".  I will bet that the previous time OS 5 had an update that also reset "threading off".  When I reinstalled Office 365 mail as instructed by Microsoft onto my iPhone I'll bet that it took "conversations on" and set "threading on"
What appears to happen is if I respond using my Office 365 account on my pc everything is okay.  When I respond to a chain of emails using my iPhone it goes to sync "sent mail" with Office 365 sent emails, since threading was off it doesn't know what to do, so it eliminates all conflicts, doesn't send the email and deletes the group from Office 365 Outlook so that everything is in sync as far as the iPhone is concerned..
I have lost all grouped emails from inbox and sent box for this week. I could turn off both "threading" and "conversations"?
Any Idea's?

Office 365 is still very buggy, this has been an issue with several 365 users on iphone as well as android

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