Question about Outlook Express

I can see all message headers in folders, but many display the "Message Cannot Be Found" error when I try to open them.  This is a recent problem that happened suddenly.  Everything was working fine yesterday. 

I can open current messages just fine.  The problem only applies to messages in imported imported or storage folders.

Anybody have a remedy?

Dear all, 

Since a couple of weeks I ve been struggeling with an issue I cannot find anything about.

I use Windows mail 2012 on my windows 10 version of windows. Have been using it for some years now. Since two weeks now all the attached files are converted automaticlally to chrome files ( htm)  that slows my laptop horribelly down. 

What can I do here? I really need help, for I use it p`rivate and professionally .

Thank you in advanced, and forgive my typos, I am Spanish. 

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