I've run into a problem with an end user. Whenever she tries to open a word or excel document through the outlook application, an error pops up (nothing specific), then it opens a completely different file. However, when she accesses outlook through a browser, the file opens correctly. Has anyone else had this problem? Spoke to Office 365 and they couldn't find a solution **YET**.
Open the temp internet folder - shell:cache is the shortcut to take you there - then open the Content.Outlook folder and delete the contents. You will need to show hidden items in File Explorer. Does that fix the problem?