Microsoft says new Outlook can't open some Excel attachments

Microsoft is working to resolve a known issue that prevents some users from opening Excel email attachments in the new Outlook client.

You don’t have sufficient permissions to open the Mail encrypted in Outlook

If you have encounter You don't have sufficient permissions error for encrypted emails in Outlook or Microsoft 365, check ...
TechBooky

New Outlook Can’t Open Excel Files With Non-ASCII Names — Fix Rolling Out

Microsoft has started looking into a problem that is preventing users from opening some Excel file attachments with non-ASCII ...
XDA Developers on MSN

Sorry, the new Outlook app can't open some Excel attachments, says Microsoft

As spotted by Bleeping Computer, Microsoft has published a new service alert related to Outlook. Labelled as issue EX1189359 and titled "Users may be unable to open Excel files attached to email ...