Problem:
My users have to re-setup Outlook (MAPI) every time. Also in LocalAppData\Microsoft\Outlook there are multiple .ost files.
Local App Data and App Data are redirected.
Each time user logs in to a VDI session there is extra .ost file created
Symptoms:

Possible Resolution(s):
Create Force Path location for PST and OST files.
Open ProfileUnity Console. Go to "Configuration Management" Edit your Configuration and select "Registry"

Add 2 Registry Rules:
Office 2016
Force PST Location
- Action: Write Value
- Hive: HKEY_CURRENT_USER
- Key: Software\Microsoft\Office\16.0\Outlook
- Type: REG_EXPND_SZ
- Value: ForcePSTPath
- Data: \\server\share\%username%\AppData\Local\Microsoft\Outlook
- Description: Office 2016 Force PST Location
Force OST Location
- Action: Write Value
- Hive: HKEY_CURRENT_USER
- Key: Software\Microsoft\Office\16.0\Outlook
- Type: REG_EXPND_SZ
- Value: ForceOSTPath
- Data: \\server\share\%username%\AppData\Local\Microsoft\Outlook
- Description: Office 2016 Force OST Location
Office 2013
Force PST Location
- Action: Write Value
- Hive: HKEY_CURRENT_USER
- Key: Software\Microsoft\Office\15.0\Outlook
- Type: REG_EXPND_SZ
- Value: ForcePSTPath
- Data: \\server\share\%username%\AppData\Local\Microsoft\Outlook
- Description: Office 2013 Force PST Location
Force OST Location
- Action: Write Value
- Hive: HKEY_CURRENT_USER
- Key: Software\Microsoft\Office\15.0\Outlook
- Type: REG_EXPND_SZ
- Value: ForceOSTPath
- Data: \\server\share\%username%\AppData\Local\Microsoft\Outlook
- Description: Office 2013 Force OST Location
Office 2010
Force PST Location
- Action: Write Value
- Hive: HKEY_CURRENT_USER
- Key: Software\Microsoft\Office\14.0\Outlook
- Type: REG_EXPND_SZ
- Value: ForcePSTPath
- Data: \\server\share\%username%\AppData\Local\Microsoft\Outlook
- Description: Office 2010 Force PST Location
Force OST Location
- Action: Write Value
- Hive: HKEY_CURRENT_USER
- Key: Software\Microsoft\Office\14.0\Outlook
- Type: REG_EXPND_SZ
- Value: ForceOSTPath
- Data: \\server\share\%username%\AppData\Local\Microsoft\Outlook
- Description: Office 2010 Force OST Location
Office 2007
Force PST Location
- Action: Write Value
- Hive: HKEY_CURRENT_USER
- Key: Software\Microsoft\Office\12.0\Outlook
- Type: REG_EXPND_SZ
- Value: ForcePSTPath
- Data: \\server\share\%username%\AppData\Local\Microsoft\Outlook
- Description: Office 2007 Force PST Location
Force OST Location
- Action: Write Value
- Hive: HKEY_CURRENT_USER
- Key: Software\Microsoft\Office\12.0\Outlook
- Type: REG_EXPND_SZ
- Value: ForceOSTPath
- Data: \\server\share\%username%\AppData\Local\Microsoft\Outlook
- Description: Office 2007 Force OST Location
Office 2003
Force PST Location
- Action: Write Value
- Hive: HKEY_CURRENT_USER
- Key: Software\Microsoft\Office\11.0\Outlook
- Type: REG_EXPND_SZ
- Value: ForcePSTPath
- Data: \\server\share\%username%\AppData\Local\Microsoft\Outlook
- Description: Office 2003 Force PST Location
Force OST Location
- Action: Write Value
- Hive: HKEY_CURRENT_USER
- Key: Software\Microsoft\Office\11.0\Outlook
- Type: REG_EXPND_SZ
- Value: ForceOSTPath
- Data: \\server\share\%username%\AppData\Local\Microsoft\Outlook
- Description: Office 2003 Force OST Location
Update, Download "Default.ini" to netlogon\ProfileUnity drectory
Product: ProfileUnity
Product Version: 5.5, 5.6+
Related KB: Error: Cannot start Microsoft Outlook. Cannot open the Outlook window...
Related KB: How to recreate OST/PST files on network location with ProfileUnity on Physical desktops