We have a puplic folder for a meeting room. I need to add/change the permissions to the folder, but I don't get the permissions tab on the calendar when I right click properties. No one seems to know who the owner of the calendar is. Can I take over and give my self the owner role or add myself to be able to get the permissions tab?

Ask an Exchange administrator. They can access the mapi properties from the server side or using something like exfolders or pfdavadmin depending on the version of Exchange.

Well I know find myself becoming the exchange admin. Running exchange 2007, is there a good guide I might be able to look at?

pfdavadmin: http://www.microsoft.com/download/en/details.aspx?id=22427 There is a readme. Its pretty self-explanatory though. Install the Pre-Reqs, Run pfdavadmin from the workstation, connect to the mailbox server and choose public folders, browse to the folder in question, go to the properties and access the permissions, add the required perms and commit it to save. You can also use powershell: http://technet.microsoft.com/en-us/library/bb310789(EXCHG.80).aspx or ExFolders: http://gallery.technet.microsoft.com/Exchange-2010-RTM-ExFolders-c76c3649