This article was previously published under Q193932
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When a Microsoft Commercial Internet System (MCIS) 2.0 POP3 or IMAP4service accesses a remote mail store that runs out of disk space, thefollowing error may occur when the POP3 or IMAP4 client tries to open themailbox:
ERR Could not open Inbox for '<user name>'.
You may also see the following errors in the Windows NT event log:
Event ID: 40 Type: Error Source: POP3SVC Description: Virtual Server 1: The inbox <path to user's inbox.idx> is corrupt and should be repaired.
Event ID: 3025 Type: Error Source: RDR Description: A write-behind operation has failed to the remote server <server name>. The data contains the amount requested to write and the amount actually written.
NOTE: This will only occur in heavy stress situations when the SMTPservice is still trying to deliver messages to the full mail store.
The POP3 or IMAP4 service attempts to log on a user to a mail store duringa disk full scenario while the SMTP service is delivering mail to the samefull disk.
To work around this problem, stop the SMTP service to reduce the load onthe server hosting the remote mail store. Subsequent POP3 and IMAP logonsshould be processed successfully.
Microsoft has confirmed this to be a problem in Microsoft Internet Systemversion 2.0 Mail.