Outlook Express (which came with Windows XP and below) is an email client provided by Microsoft for Windows users. The Windows it self is sometime give you a headache, and OE can give you another problem.
From this site, OE has a maximum 2 GB of .DBX files. DBX files is a file of OE for each folder in OE, as shown on the picture. When DBX file size reaches 2 GB, OE may not receive emails. It will say that there is an unknown error, as usual :D
To solve the problem is easy.
- Change the name of the file: Inbox.DBX to Inbox 2.DBX
- Run send/receive command
- OE will receive new emails and create a new Inbox.DBX automatically
Now there are two INBOX folders: Inbox.DBX and Inbox 2.DBX. New emails will go to Inbox.DBX by default.
To avoid this problem in the future, you can setup mail rules (filter) to separate emails by sender. Or you can manually move old emails to new folder manually.