I have a Public Folder I'm try to read
All Public FoldersMail Foldersregister (SBS 2011 w EX2010)
When I try success = imap.SelectMailbox("public folders/Mail Folders/register")
I get an error that the folder does not exist,
To understand what folders exist, write some test code that lists the mailboxes. I don't know what programming language you need, but there are examples for it on www.example-code.com. This is the C# example: http://www.example-code.com/csharp/imap_listMailboxes.asp