Move Apps from old hard drive
Generally speaking, only applications that were installed via drag and drop can be directly transferred from one drive to another via drag and drop.

Applications that use installers, such as Microsoft Office does, have to be properly installed from their installation media and you will need the product key in the case of Microsoft Office.

If you have a Time Machine backup of the old hard drive, you can get the product key out of its plist file and use it, if you can borrow a copy of the same version of Microsoft Office from a friend and use your product key to install it.