Hey Techguy,
This is very very frustrating. They new that there was an issue with the 2.12.1 agent in regards to adding attachments apparently, otherwise you wouldn't have had the issue. Is the SR still open or did you eventually throw in the towel?
Because we have a lot of users that are getting frustrated my guess is we will go back to the old agent.
We did find out a bit more info after digging into a little deeper. It doesn't seem to be a security issue but more of an issue the way Appvolumes in combination with a Profile writable volume handles the %LOCALAPPDATA% folder. It seems as if for some strange reason it tries to add a file from the %TEMP% directory or the Temp internet Files but can't use or cope with the name it creates. Both folders are under the C:\Users\%username%\Appdata\Local folder.
When attaching the file into Outlook we saw the following error. As you can see between username and Appdata there is no \. And it tries to create it within the writable volume, not the local drive which off course is correct if you use a writable.
9:58:58,1233886
OUTLOOK.EXE 3028
CreateFile
C:\SnapVolumesTemp\MountPoints\{610729b8-5656-11e7-a441-005056b24a62}\SVROOT\Users\myusernameAppData\Local\Microsoft\Windows\Temporary Internet
Files\Content.MSO\filename.zip\:Zone.Identifier:$DATA NAME
INVALID
Desired Access: Generic Write, Read Data/List Directory, Disposition:
OverwriteIf, Options: Sequential Access, Synchronous IO Non-Alert, Attributes:
n/a, ShareMode: Read, Write, Delete, AllocationSize: 26
If we get any more info I will let you guys now. Thing is that it seems to boil down to the writable as users that don't have a writable are using the 2.12.1 agent happily.
).