When Ik quit MLO I see an entry in the MLO settings hotkey part in the registry:
actQuickOutlookConnect Reg_DWord 0x0000c04f (49231)
As far as I know there is no other app using the same combination of keys. No other app responds.
Adding the hotkey:
Tools - Options - Hotkeys
scroll down to and select Sync Outlook
select Hotkey field and enter the required hotkey (in my case
alt.gr & o, which results into 'CTRL + ALT + O' in the Hotkey field) - Modify - Apply - OK
René