Problem: I had problem in Microsoft Outlook 2010 that not all selected emails were moved using either Quick Steps or Move.
Typically I reply to an email and mark it to be followed up and then select both the one in the Inbox and the one in Sent Items and move them to another folder. I either select the emails by expanding the conversation or through a search. Drag and drop is no problem but using Move or Quick Steps from the Ribbon does not work.
Solution: I wondered if it was some bug moving multiple emails but eventually found that “Don’t move flagged messages” in Outlook Options under the heading Conversation Clean Up was checked. When I unchecked it I got the emails moved as expected, problem solved.