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Testa detta. Tog Copy paste från min how-to fil på jobbet men hoppas du förstår, den ska vara skriven enkelt.

Close down all the open office programs. Don't forget to ask the user if they need to save any files before you do this.
Open the windows search bar and search for the program "regedit". The program wont show if you don't search for its full name.
Open the program and in the left menu panel, locate the folder "HKEY_CURRENT_USER\Software\Microsoft\Office\1x.0\Outlook\Preferences". Edit the "1X.0" to the right version like this:
Outlook 2010 = 14.0

Outlook 2013 = 15.0

Outlook 2016 = 16.0

When the correct folder is selected, you'll see a pane with a table, containing some images, names, types and values (called data), see image 1.0. Right click somewhere inside this pane and select "New" > "DWORD (32bit) value".
When selecting this, a new row in the table will appear with a highlighted text. In the new row, write "DelegateSentItemsStyle" and press the Return key.
Right click the new row and select "Modify...".
In the "Value data" field, write "1" and select "Decimal" in the "Base" list to the right.

If you've followed above steps and the issue is still present, try resetting the outlook folders. This is done by opening the windows search bar and executing the following two commands: "outlook.exe /ResetFolders" and "outlook.exe /ResetFolderNames".