Unable to add calendar entry - error outook data file has reached maximum size

Hi,

I am running Windows 10 with Office Pro 2021/Outlook 2021.

I am getting the maximum size error message when I try to add or even delete a calendar entry.

The actual sizes of my .pst are 1.9gb and .ost ARE 50mb, no where near the max size of 50gb documented for both file types. I have also run compress on all of the files with no change.

The registry entries for max file sizes do not exist.

Any ideas?

Thanks for the help!