There are two ways by which emails & other mailbox items gets deleted permanently or greyed-out. At this point use the software to work around the situation.
In given conditions recover deleted email in Exchange 2010 – 2003 edition only via specialized solution. So that no information is lost or missed and work continuity is not hampered.
This is how an Exchange 2007, 2003 & Exchange 2010 recover deleted items through implementation of a self-start product.
Free demo version of program exports on 15 items per user mailbox into PST files. In contrast, full version does not impose any limitation but it guarantees 100% data conversion from EDB file. Buy full version at $299.