The cause appears to be the use of non-ASCII characters in file names. Microsoft describes it like so: “Any user may be ...

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

Use the following solutions to get rid of the “Sorry, Excel can’t open two workbooks with the same name at the same time” error message in Excel. To unhide the ...

Are hyperlinks not opening or working in your Excel workbooks? In Excel, hyperlinks are used to open specific documents, files, folders, or web addresses saved on a network server, intranet, or web.

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 ...