I have multiple accounts, and multiple devices sharing applications. To follow up the other responses, your App Store account can be separate from your iCloud, Messages, and FaceTime accounts. I use a separate account (Apple ID) for iTunes purchases than my iCloud account.
Running .EXE Files With WineHQ. From your Ubuntu command line type $ wine application.exe where application is replaced by the name of your .EXE file. This method will only work if your file is located in a path location. WineHQ gives these examples: Path=c:\windows;c:\windows\system;e:\;e:\test;f:\..
I think that'd be the default word processor that comes shipped with Ubuntu, LibreOffice. You can also choose to run Office 2007 under wine, that should work. To make things easier there are tools like Winetricks and PlayOnLinux.