Outlook 2010 is always on top of other applications, why?
Make sure that there are no add-ins installed.
Edit to answer comment, originally from noocyte: You can see all loaded Add-ins in Outlook via "File - Options - Addins". Use Windows Add/remove programs to remove then.
If nothing helps, try to re-install outlook.
Another simple trick to try:
- Right click on Task Bar
- Click "Lock the taskbar"
- Then again click on "Lock the taskbar"
- Restart Outlook
Disabling the social connector add-in may solve this.
File → Options → Add-ins manage:COM Add-ins
Click on Go.
Uncheck the social connector add-in.