The store C:\Users\monte\AppData\Local\Microsoft\Outlook\archive1.pst has detected a catalog checkpoint.

Problem: The store C:\Users\monte\AppData\Local\Microsoft\Outlook\archive1.pst has detected a catalog checkpoint.

Solution:
Run the scanpst.exe on the outlook file and the archive files that open with outlook, some errors will be found, also check the size of the pst file and the archive files.