If any of the Outlook storage files are approaching the maximum size (2 GB) you will receive this warning. Check folder/files sizes by going to the directory C:\Documents and Settings\%username%\Local Settings\Application Data\Identities\{??????}\Microsoft\Outlook Express (normally under the identities folder there is only one sub folder. Look at the size of the files in this directory and if any files are near the 2 GB limit then you will get that warning message.
The easiest way to get into trouble with Outlook Express is to put all of your folders under the Inbox, This means that all of the sub folders count against the Inbox size limit. If this is the case then just drag the folders out to the local folders level.
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