KB0141 - Error 'Custom folder icon is not allowed for a folder not displayed in Outlook'
OnePlaceMail + Office Release 1702: Build 7870.2024 (Current Channel)
When you upgrade Office365 to version 1702, build 7878:2024, and install OnePlaceMail an error appears on restart.
Changes made to the path of the PST in Windows, caused the PST to not load correctly.
1. Check your current version of Office
In Outlook, select File, Office Account and take note of the release and build number. If this matches 1702 7870:2024, upgrade to the current release.
2 Remove PST
If the file path of the PST has been affected, the PST needs to be completely removed before rstarting Outlook.
The steps are
Browse to File | Account Settings | Account Settings
Select Data Files
Locate the OnePlaceMail PST.
In Windows Explorer
Browse to C:\users\<username>\appdata\local\OnePlace Solutions
Delete the oneplacemail.pst located here.
The PST will be re-created automatically after Outlook has been restarted.