I just upgraded laptops and imported all of my email messages in Windows Live Mail 2012 running Windows 10 to Windows Live Mail 2012 also running Windows 10.

I went to save an attachment and I got this error:  "There was an error saving one or more of the attachments. Please check your free disk space and try again" - which is impossible because I have a 2TB hard drive with more than half of that free.

Of course I read all the forum on this topic which originated as far back as 2009 apparently, and found no solution, but managed to fix it on my own. 

Make sure that the PROPERTIES of the destination location (in my case C:Temp) is not flagged as "Read Only" so that you can actually save it through this email client (WLM 2012). 

I don't understand why this happened as I created said folder as an Administrator in both environments (laptops), but it seems that the old machine which had migrated from Windows 8 to Windows 10 kept its original "properties", but for some reason on a clean Windows 10 machine, even though it allows you to create the folder and copy to and from it it via File Explorer no problem, in WLM 2012 infinite wisdom decided to not allow Windows Live Mail 2012 attachments to save, and with a misleading error message on top of that.  Thoughless, but true. 

Ccleaner did not work as suggested, nor patches, much less updates made any dif either.

One hopes that this thread will save hours of digging around for no answers on the net for this issue, until today's posting. 

I simply don't understand why there are so many layers of this stuff, which while I understand is built for security, one should not have to lose their hair and bite their nails off to find such a simple answer. 

Also, the Email topic pull down in the forum discussion should also have an added discussion field for "Attachments," or "saving attachments" - or something like that - it would be more relevant too. 

A better clue in the error message in the first place would have been nice, but God forbid that simplicity be built into anything these days.