We have many public folders and I need to be able to set permissions on more than one at a time. In exchange 2003 you had a wizard, but with exchange 2007 that seems to have gone. Can anyone please tell me how I can achieve this?

The best tool i have found to do this with is pfdavadmin. http://www.microsoft.com/downloads/details.aspx?FamilyID=635BE792-D8AD-49E3-ADA4-E2422C0AB424&displaylang=en Assign the permissions to the top level folder, and then right click on the folder and choose Propagate folder ACEs, and then you will have a list of accounts to propagate.

also, if the folders are all under one tree you can use get-publicfolder "Top Level Folder Name" -recurse | add-publicfolderclientpermission -accessrights "editor" -user "sally" substitute editor for whatever rights you want to apply, and probably all your users aren't named sally :-). good luck.