An annoyance that I cannot discover what is happening.
After an email to a client is sent, I click forward so I can then drag the mouse over the header, date etc and copy and paste this into our work management system (proving that an email has been sent)
From time to time the mouse will not drag, I have to use the arrow keys to highlight the text to copy.
Closing Outlook corrects the problem
Is there a key/combination that I am inadvertently hitting the creates this behaviour?