I've always used Outlook Express for all my emails and 3 times recently, OE has for some unknown reason deleted about 75% of my emails. They aren't completely gone, but they wont read in OE. I have to use an OE recovery tool to read the DBX files and get them back.
I get about 1000 emails a day, so I know OE is a terrible program to use. What is a good business level email program to use?
Outlook Express is so bad for handling large databases. I am also using Thunderbird and like it better than Outlook or Outlook Express. Superior multiple account handling is what I like best. If you stay on with OE you will keep getting corruption. good luck