In the past few weeks - including 10 days of the most frustrating support calls ever - I finally cracked my issue on the day that level 3 called me back and confirmed what I had discovered (trial and error).
In Outlook 2016 desktop, there are two routes to adding an account
- Auto Account Setup - this works with your online Outlook address / Microsoft Account - but NOT if you have a 3rd party email set as your Outlook Primary (which was my case - my Microsoft Primary was set to mike at madeupname dot com. If you use your an
Outlool emai as primary, it will set you us automatically with a Microsoft Exchange type
2 Manual setup which offers Office 365, POP3/IMAP and Exchange Active Sync. On the old platform, the solution to using a madeupname email which had been set as primary on your OWA (Outlook Web Access) was to use the Manual > EAS option. So both my OWA accounts
were set up in my Outlook desktop like this. And I could drag/drop emails from one to the other (as well as the POP3/IMAP accounts I had set as send only in Outlook desktop).
This worked fine until Microsoft migrated to the new platform for Outlook Web Access then the drag/drop stopped working.
I then tried to change my primary to the Microsoft Account (instead of the 3rd party) and that changed was sync'ed with Desktop but still moving mails from one account to another wouldn't work. Also got the sort of issues in sent from as highlighted in other
posts here.
The solution/workround I found was to set the OWA primary to the Microsoft at outlook.com one. Remove the Outlook desktop EAS connection (make sure it's backed up in case it goes wrong). Then add the same account again using Auto Account Setup - this time
it should add it as Microsoft Exchange and NOT Exchange Active Sync.
Then you can drag and drop in Outlook desktop from one account to another.
I have also setup my connected accounts in OWA (so the mail arrives in OWA and if needed I can send from it under any name).
I have setup the same accounts as send only (in Send Receive Groups) in Outlook Desktop so I can send from there in any name also.
This even works with (as I have) two Microsoft Accounts syncing with Outlook desktop which also has 3rd party accounts as described. I can send from any of them, drag and drop to the right one and reply from name2 even if the mail had been sent to name1.
The issue seems to have been that
- you can't setup a Microsoft Account automatically in Outlook if the primary is a 3rd party one (not the outlook one) 2. so if you want to have a 3rd party email as primary, the only solution is to set it up as EAS and that won't work properly now.
However if you change your 3rd party email primary back to the outlook one, and add the same account afresh through Auto Setup, you'll get a Microsoft Exchange connection which will allow the drag / drop / send from as described above.
Be warned - if you change your primary more than twice, the system blocks any more change for 10 days (not the "next week" given in the error message) so plan first.
It is also typical of Microsoft to expect normal people to spot the difference between Microsoft Exchange and Exchange Active Sync - they both look like Exchange from a company called Microsoft to me!