You can create an in-tray folder which you can share with other users. This can for example be used where a lot of scanned documents need indexing and the workload can be shared across more than one user.
To create such a folder click on the In-Tray Folders icon on the Standard ribbon. Right click on My In-tray and select the New In-tray option. Give it an appropriate name and then right click on it and select Sharing. This will allow you to select the users that you want to share this with. You can then drag and drop documents into it for them to work with.