We have a problem! Anyone planning to upgrade from 2007, be warned of the following:
There is a known problem with installing Exchange 2010 in a domain including 2007 in that it "upgrades" your public folders so that you can no longer remove them in 2007; you get an error along the lines of:
"Object is read only because it was created by a future version of Exchange"
The fix, and only way to then remove it, is to use the Remove-PublicFolderDatabase PS command from the 2010 server.
Now to spin on to 2013, the only way to create a new 2013 Public Folder is to first delete the old 2007 ones and as soon as you have added 2013 to the domain, guess what you can’t! And what’s more, because 2013 doesn’t have Public Folder databases it no longer has the Remove-PublicFolderDatabase command!
So what now? Can’t delete in in 2007 or 2013 and can’t move forward with 2013 until I do!!!