Greatings!
Some time ago it happend that I lost (in my inbox) about 6 months of emails in the way that there was year 2013, part of 2014 and whole 2015. So there were some emails missing in the middle. I did not deleted them or similar.
Now I got the same problem. In the inbox I am missing 3 months of emails for this year.
My files are not larger than 2GB, so its not this kind of problem.
I believe there could be some corruption in index or sth similar. What programs do you suggest to test/repair my email database files?

Thank you!

If it really is Outlook Express, there was a program called DBXtract that would extract the individual messages from the .dbx files.

Also, I have used one that I think was called OERepair, but am not sure of the name anymore.