I have the solution, Thanks all.
Maybe you have too many messages in these folders.
If you are using almost any Windows version other than Vista, turn off the connection to the internet. Open OE. Click File|Folder|Compact all Folders. When finished you can turn the connection to the internet back on, but perhaps reboot.
Any better success?
If indeed the problem is too many messages, another action to take (before the above) is to create new folders (like "Old Messages1, 2, etc.) in OE and move messages you use seldomly there. That could solve the problem, but Compacting usually is also adviseable.
You may find this article of interest.
http://www.microsoft.com/windows/IE/...orruption.mspx
Note the role of Folders.dbx.
P.S. If after deleting you find you have lost any messages, you may find them in the Recycle Bin in .bak files.
http://support.microsoft.com/kb/918069/en-us
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