When I login, I get the error below. I cannot access my inbox.

ERROR: Could not complete request.
Query: SELECT "INBOX"
Reason Given: Mailbox isn't a valid mbox file

Please tell us about your system---e.g. what version of Linux, and what software you are using. When you say "login", does that mean loggiing in to the computer--or perhaps logging in to your e-mail account?

the more detail you can provide, the better the chances of finding an answer.

The operating system is:Redhat Enterprise Linux 5
Linux version:1.580

when i try to login to the user account for one of my mail users using webmail i cant see what is in my inbox it gives me the error i previously posted on the forum,but i am able to see the mails when i click on Readmail for this same user in webmin.hope this is enough information.

I'm guessing that you are running a mail server----you say that you use webmail to access the account of "one of your users". Again, please give complete details...

If my guess is correct---can you use webmail to get to other user accounts?

i am running a mail server on the Linux platform who's details i just gave you. Users use webmail to access there mails from there pc's which sit on the server, if outlook is not configured on there pc.then i use webmin for web-based interface for system administration of this Linux server.now i am having problems with one of the users trying to login using webmail with there account(username ,password) it brings up the error below,this is not a new account it has just started giving these problems,and its the only one giving this error.
ERROR:
ERROR: Could not complete request.
Query: SELECT "INBOX"
Reason Given: Mailbox isn't a valid mbox file

Are you sure that user didn't change their password & let you know of the change?

no they didnt,i actualy reset the password because i thought so initialy as well,and since they do not have access to webin so they cant change the password.its only me who has access.

Is there a way to list all users to see if the user account wasn't accidently deleted?

its not possible because when i login to webmin,i am able to open this account and even view or read the mails in the in box

I would export the e-mails, if possible, delete and recreate the account, and then import the e-mail back in, if it's important stuff.

Thats a good suggestion but how i do it i think thats where the problem is ? and to what form should download them.

rather how do i do it?