In Windows 7, with Microsoft Outlook 2007 installed, when pressing the "E-Mail" key on keyboard, a new Outlook process will appear (also the same if the link into Start menu is pressed). Anyone know if is possibile to open a new Outlook the first time, then show the current open Outlook next times key (or link in Start menu) is pressed? Thanks to all.
Finally, I get solution for my question. After a deep search I have found /recycle option for Outlook.exe (here: Single-window outlook? ).
I have tried to change default Mailto windows application in registry.. Without success. But I have found how change multimedia keyboard "mail" button behavios: open regedit, go to HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\AppKey\15 (15 is standard key code for APPCOMMAND_LAUNCH_MAIL multimedia key). Here add a new string value named "ShellExecute" and set it to:
"C:\Program Files\Microsoft Office\Office14\OUTLOOK.EXE" /recycle
That's all. Now, when pressing "mail" keyboard special key, it will display the current Outlook windows.