This problem has now gone away without my making any further changes to Outlook.
It starts in the gmail Inbox, without giving the error message.
Perhaps some resynchronisation with the gmail server was done automatically.
Thanks for your help.
The account is actually listed as imap.googlemail.com (i.e. it doesn't contain my mail username)_
At the bootom of the dialog it says: Selected account delivers new messages to the following location
imap.googlemail.com/Inbox in data file C:/Documents and...
Diane, thanks for responding to my query.
No, I didn't redirect any folders. I have a very simple setup - just a home PC and gmail mail. If I set Outlook to open with Calendar, that works fine. And Mail on my ipad opens in the Inbox. It's a bit strange, but not critical.
I'm using Outlook 2010 with gmail imap.
I want Outlook to open up in the imap Inbox, and I have set it up by going to:
File/Options/Advanced/Outlook start and exit
and browsing to imap.googlemail.com/Inbox and putting that in the "Start Outlook in this folder:" box
Now when Outlook...