Hi, sorry for the delay, I was just double checking.  

 

The answer is signatures are stored on the mail server in the users mail folders so they are already mirrored.  You are correct however that 'uploaded files' ready for attaching to a message are not mirrored, it is assumed these are 'temporary' in nature and not something that needs to be mirrored.  So currently they are not.

 

    ChrisP.