Outlook 2010 - storing .PST file in your preferred location

Close Outlook
Create a folder where you want to put the IMAP datafile
Copy the PST file with the name of your IMAP profile from C:\Users[Username]\AppData\Local\Microsoft\Outlook to the desired location (eg the new created folder)
Afterwards, Click Start / Run and type "Regedit" (You'll need administrator rights for this)
Go to HKEY_CURRENT_USER\Software\Microsoft\Office\14.0\Outlook
Add a REG_EXPAND_SZ (Expandable String Value) with the name: ForcePSTPath
Fill in your new folder
Start Outlook