Please Please Please Bring Back MDI. SDI simply doesn't support the types of applications I have spent my career developing in Excel
Please bring back MDI for Excel. SDI is really slow, and crashes when I run the apps I've developed over my career that rely on multiple workbooks loaded simultaneously. Or re release 2010 and just call it the version for the folks who rely on MDI and there are a lot of us!!!!!!
this idea is already out there with over 900 votes see below: