
The other fix that you can use to try and solve the “Download failed” on all attachments in the Windows 10 Mail app issue is to delete and then re-add your email account. Solution 2: Delete and then re-add your email account If this doesn’t fix the problem, however, give the next solution a try.

If the problem has been solved, you can go ahead and install all the third-party security programs you want, but just make sure that you don’t reinstall the programs you uninstalled in the first place. Once you have disabled or uninstalled the program(s), check to see if the problem persists. If you have any third-party antivirus, antimalware or firewall programs installed on your computer, disabling them (or rather uninstalling them entirely), might fix the issue. Solution 1: Disable any and all third-party antivirus and firewall programs For some reason, users affected by this issue can easily manage to not only view but also download attachments if they access their email accounts through an internet browser. The workaround for this problem is pretty simple – just access your email account using a browser (such as Google Chrome or Mozilla Firefox) and view and download all the attachments you want to. Thankfully, there is viable workaround for this problem, along with a couple of solutions that you can use to try and fix it. Not being able to view the attachments you receive with emails, especially in a technology-governed era such as this one, can be extremely troublesome. While some speculate that this issue is being caused by problems with Microsoft’s Mail servers, others seem to believe that third-party firewall and antivirus programs are to blame for this problem. This issue basically causes all attachments (save for one or two, in the cases of some lucky users) to fail to be downloaded, causing a “Download failed” message to appear beneath them when they are viewed in the Mail app. In addition, the Mail app does not seem to be the only desktop mail client affected by the issue as the Outlook app, the Nine app and all ActiveSync apps also seem to be affected by it. This is the case with an extremely significant percentage of all Windows 10 users, and the problem even extends to users of the Windows 10 Mobile Operating System.

Many Windows 10 users are currently complaining of all of the attachments they receive with emails failing to download on the built-in Windows 10 Mail app.
