You may get an error prompt displaying the error message Microsoft Office cannot open this file because some parts are missing or invalid when you try to open a Word ...

Several Outlook users, on different forums, have reported encountering the error “OST file cannot be opened,” when trying to open the application or sending ...

Learn how to use a Microsoft 365 setting that lets you determine whether to work in an online or desktop environment for each file. By default, Microsoft 365 saves files in the environment where you ...