Not long ago I switched to Microsoft Outlook 365 Classic for my email provider.

I managed to import everything I need from my old remail provider, including previously saved emails. Initially I was able to read my saved emails but now I can't.

When I goto my saved emails they are listed with my email address as the title accompanied by a date and a time.

When I try to open the saved emails I get the message This file cannot be previewed as their is no previewer installed



Any idea what is/maybe the problem and how to solve it.

Is the problem that your old Outlook messages won't open? Or is it that certain old messages with ATTACHMENTS won't open? If the latter, what kind (or kinds) of attachments trigger the error? Word documents? PDFs? Excel worksheets?

DJ

When you say "I managed to import everything I need" - How, exactly, did you do this? e.g. Copy over a PST file from your old client? Used the Outlook Import operation?

You may try to copy your PST file to another computer with working Outlook and see if the issue persists. If yes, then your PST file is corrupt and you can use scanpst to fix it.