Cannot open INBOX

Hello!
I have used Mulberry for many years, but in the last few days, have managed 
to mess it up on one computer. And, a problem cropped up on another for 
less clear reasons. Both are running WinXP Pro, and Mulberry 4.0.8. I will 
start with the big problem:

The problem is on a laptop: I was disconnecting, and downloading my Inbox, 
but lost the connection in the middle. Now, when I try to open the Inbox, I 
get "File not found while selecting a mailbox."

The other problem is on a desktop. I routine send mail to the Outgoing 
Queue which I leave disabled until I have a chance to double check what I 
am about to send. For unclear reasons, after I do that, and then press 
Disable, Mulberry reports it is unable to connect to the SMTP server, even 
though it just successfully sent an Email. This is annoying, but not 
critical.

Can someone suggest fixes?

I would be most grateful!
BT Walsh