Problem:
As preparation for migration of my users to VDI I would like to recreate OST and PST files on network location without losing local copies on physical desktops
Symptoms:
One of the way to approach is to create symlinks and redirect that folder to a share or mounted VHD (optional).
Possible Resolution(s):
Open ProfileUnity Console, Edit your configuration, go to: 
Create 2 Application Launcher rules:
1) Delete old folder:
- Filespec: %systemroot%\system32\cmd.exe
- Arguments: /C rmdir /q /s "c:\users\%username%\AppData\Local\Microsoft\Outlook"
- Timing: After Configuration Execution
- Run Asynchronously: Un-selected
- Schedule: Everyday
2) Create Simlink
- Filespec: %systemroot%\system32\cmd.exe
- Arguments: /C mklink /D c:\users\%username%\appdata\local\Microsoft\outlook \\server\share\%username%\Outlook
- Timing: After Configuration Execution
- Run Asynchronously: Un-selected
- Schedule: Everyday
Example:
Note: "\\server\share\%username%\Outlook" - This is the network path where the Outlook files will be stored.
Related KB: Users are having to setup Outlook (MAPI) Profile each time the log in & Multiple *.ost files
Product: ProfileUnity
Product Version: 6.0+