When I got the error though, I looked a little more deeply and found that I had both Office 2013 and Office 2016 (the latter described as Microsoft Office 365 Pro Plus) installed.
EMAILS STUCK IN OUTBOX OFFICE 365 UPGRADE
I had not seen any notification of an upgrade completing.
I use Office applications by clicking shortcuts on the taskbar, and these were still for Office 2013. Perhaps I clicked the upgrade offer back in May and had forgotten about it.Īs far as I was concerned, Office 2013 had not in fact been upgraded. I suspect my problem was related to an issue that caused Microsoft to pause “Microsoft-initiated upgrades” on May 9 2016. I don’t recall seeing this, but it is possible. Users are meant to see an upgrade notification before this occurs. In particular, the problem was connected to a an automatic upgrade from Office 2013 Professional Plus to Office 2016 Pro Plus, for users on Office 365 E3 subscriptions. This error can indicate a corrupt installation, but in my case it was simply an Office 365 mess-up.
Therefore, emails were stuck in the outbox with no notification. It was particularly annoying that the error affected sending emails, but the error dialog only showed when I tried to force a send and receive.
Well, it still received mail, but many operations threw up an error, “Not Implemented”. Outlook broke on my laptop the other day.