For users who often use alt-tab combo, it becomes even more annoying....
There is no way to disable this feature in Outlook but it can be configured so it does not freeze the outlook.
The reason it freeze outlook is because the Outlook requires resources such as network connection, CPU cycles to bring up the research pane. This becomes much time consuming when Research Pane are configured to do many things. So naturally, the way to decrease the startup time of the pane is to reduce the options Research does. In other words, removing all options from Research equals virtually disabling this feature.
Here is how to do it:
- Bring up the Research pane by Alt + Left Click on a word
- Find and click "Research Option" at the bottom of the pane
- Uncheck options that is not required, all simply uncheck all
- Save the changes by clicking "Ok"
Hope that helps.