If a user has enabled desktop DPI scaling, due to poor eyesight, or increasingly, as a default setting on new high DPI laptops, you may find that your emails fonts are much larger and tables appearing folded together.
Luckily there is a way to fix this problem in Outlook to make VML and images scale properly. You can place the following markup in the <head> of your emails HTML, and don’t forget to include the XML namespaces!
<!--[if gte mso 9]> <xml> <o:OfficeDocumentSettings> <o:AllowPNG/> <o:PixelsPerInch>96</o:PixelsPerInch> </o:OfficeDocumentSettings> </xml> <![endif]-->