My Outlook (version Office 2007) is not loading properly. If I click New Email, or Send/Receive etc, a dialogue box saying "not implemented" pops up.

The background to this is: I recently ditched Office 365 and reinstalled Office 2007 which has been functioning fine, but I did not uninstall Office 365 till just now (in case there were any issues). All I did was uninstall the Office 365 programme, nothing else, and now my Outlook (Office 2007 Outlook) seems to be paralysed. I've set Office 2007 as my default programme for Email. Switched off/on etc, but still no change.

Can anyone help?