1) Outlook continuously tries to sync and has increased my network traffic 5 or 6 times the previous activity. In Outlook error box (yellow triangle at bottom right corner) this message continuously loops: Could not synchronize record: Inbox to Exchange server: IBC Office 365. A folder with the specified name already exists. Error code -19917 Could not synchronize record: Contacts to Exchange server: IBC Office 365. A folder with the specified name already exists. Error code -19917 Could not synchronize record: Calendar to Exchange server: IBC Office 365  A folder with the specified name already exists. Error code -19917. THe list of errors is about 15 and once it goes through the list it starts over, repeating over and over in an endless loop.

2) I have looked at library folders. The calendar sync cache file is more than 2 gigabytes. That seems too large.

3) I have performed a database rebuild. It did not help the problem.

5) I have removed folders out from underneath the Inbox folder. It did not help the problem.

6)  I have been discovering that many emails did not convert to my new Office 365 account.

7) The Office 365 technical support team are slow, they are undertrained and they constantly stall for time.