corrupted inbox 0x800co133

I returned from a trip to find my outlook express e-mail system had (1) erased my address bood completely) and worst (if that is possible) the inbox does not work although I am able to send e-mails alright

the on screen messages are :

initially: error number 0x800co133

then .........

An unknown error has occurred. Subject 'Outlook Express Error 0x800c0133 (corrupted inbox file)', Account: 'l.blackburn', Server: '', Protocol: SMTP, Server Response: '550 5.7.1 Client does not have permissions to send as this sender', Port: 587, Secure(SSL): Yes, Server Error: 550, Error Number: 0x800CCC69

I would appreciate any assistance on how to fix the ptroblem with in box and of course any ideas on how to find my address book