Outlook - 'Personal Folders' Not closed properly "The data file 'Personal Folders' was not closed properly

Try to repair your pst file.
Follow these steps:

1. Exit Outlook if it is running.
2. Double-click Scanpst.exe, located at C:\Program Files\Microsoft Office\OFFICE1X
3. In the "Enter the name of the file" you want to scan box, enter the name of the .pst or .ost file that you want to check, or click Browse to search for the file.
4. To specify the scan log options, click Options, and then click the option that you want.
5. Click Start.
6. If errors are found after the scan is complete, you will be prompted to start the repair process to fix the errors.
A backup file is created during the repair process. To change the default name or location of this backup file, in the Enter name of backup file box, enter a new name, or click Browse to look for the file that you want to use.

7. Click Repair.
8. Start Outlook by using the profile that contains the .pst file that you tried to repair.