I have only recently realised that Outlook (I'm using 2010) isn't obeying my line-height:130% rule. Obviously we can use
mso-line-height-rule:exactly; before setting a line-height but this only seems to work when you specify a fixed pixel height. That's fine for some stuff but when I tested it on some existing emails with buttons and tables it completely borked them and I had to spend ages trying to fix them. Are there any other solutions?