This morning when I turned on my PC and went to open my email, suddenly mails won't open with a double-click on the left mouse button as they always have done. I can open them by right clicking and clicking Open on the menu, but not just by double-clicking. I have turned the PC on and off, several times, I have checked the Control Panel, the Mouse setup options, made sure the 'double-click' box is ticked, I have checked the Tools Options menu in Outlook, I have moved the mouse port on the CPU and switched on and off, etc. I have even spent a couple of hours looking on helpsites... I am sure it must be a really really simple thing, but I am admitting defeat. Where do I find the answer to this one, please? Anyone...?