Google úr szerint:
http://www.panix.com/help/app-pages/mac.oe5.html
"Known Issues & Bugs
Users have reported getting a "Disk Full" error when attempting to download mail with Outlook Express 5.x, even though they have plenty of disk space available on their computer. The cause of this seems to be when a particular file OE uses to index its mail reaches 2GB.
The reported fix is to either delete some of the mail stored locally (the Sent Messages folder is a good bet), or else to compress the database. To do so, hold down the Option key while opening Outlook Express. It will ask if you wish to compress the database; click "Yes"."
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trey @ gépház