Question about Outlook Express

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In Windows Live Mail I get the message "Folder could not be displayed" on Inbox, Sent items and all the Quick views folders. Possible causes are given as "Low disk space or Low memory". If I check Inbox properties it tells me that it contains 4944 messages, 4840 unread. However, if I look at Inbox and Sent items in the Windows Live Mail part of C:\ I find that they are empty.  All my Storage folders are intact and are accessible. Also if I search my user folder using .eml as search key all I find are the messages in Storage, which confirms that the properties report on Inbox is quite wrong. How can I recover the contents of Inbox and Sent and stop getting the "Folder could not be displayed" message?  One other anomaly is that when I start WLM I get the message "Recovering Windows Live Mail database" yet clearly it fails to do so.

I have just tried to drag a number of emails from my inbox together to a storage folder- a process a have done many times without problems. This time however several of the emails weren't transferred and have also Disappeared out of he Inbox. Where are they? Can I retrieve them? They are not in the deleted folder. I am using Windows Live Mail.

What is the maximum attachment size I can receive in Windows Live Mail and can I adjust this somehow?

                When attempting to delete some emails I get an error message and they will not delete. All of the undeleteable messages occuried on July 9,2019. Please advise.

How can I backup emails in this software?