Yesterday I had a message that I could not "get mail" because my inbox was full and that I should delete some files or compact. It only had about 20 messages in it but I had ignored suggestions that I compact for a while so I went to the menu and hit compact. Then I could get mail and I could open it while it was in my inbox. This morning I got mail and I was able to look at it and I deleted quite a lot. A little later (I had restarted my computer in the meantime) I wanted to look at an email in my inbox. It appeared to open but had no content at all. Similarly when I looked at the message at the bottom of the screen it did not show there at all. The only messages in my inbox that I can look at are the two that arrived today. I am able to open messages that are stored in other folders. But moving a message from the inbox to a folder does not make it able to be opened. Another odd thing; in the inbox, one message that I can open shows the wrong sender - the sender of a message I had been moving to see if it could be opened if it were stored elsewhere; but the sender is correct when I open the message. It is all very weird.