I need help please!  I use a Mac Outlook 2011.  I have set the signature to arial 10 and when I send it seems to work well.  When emails are returned in their fine and maybe 12 when I reply it makes my signature go from 10 to a mixture of 10, 16.  it looks unprofessional and i have tried unchecking the box about font when replying but tis no use.

Do I just go back to a PC rather than Mac?

Thanks for help