I'm running Microsoft Office 2011 on an iMac. When I launch any MS Office program, the program automatically opens the last document I worked on in that program, from the previous day, week, whatever. It happens if I double click a document on the server to launch the program, or if I open an email attachment, using the program for the first time that session. It's inconvenient and can be awkward if someone is looking over my shoulder to view the document I'm opening.