In the meanwhile, I installed Thunderbirf. There one can specify, if a new folder shall contain folders or messages. In case of creating a folder for folder, it works. This setting is missing in Outlook, or I cannot find it.
PMail and Mercury foldering does not support both folders and messages in folders.
From the PMail help:
This server supports folders within folders: Some IMAP servers will allow you to create mail folders inside other mail folders along with the messages they contain, while some will not. Servers that do not allow folders within folders will create trays that can contain folders, just like Pegasus Mail's standard folder view. Checking this control helps Pegasus Mail to work out how it should go about creating folders for you on the server. At the time of writing, the following common IMAP servers do support folders within folders (i.e, this control should be ticked if you are using one of these servers): Netscape IMAP Server, Microsoft Exchange IMAP Server, Novell GroupWise IMAP Server, Cyrus IMAP Server. Most unix-based IMAP servers, especially the University of Washington UW-IMAPD reference server do not support folders within folders, and hence this control should be left unticked if you are accessing one of these servers. Mercury/32, Pegasus Mail's companion product, shares the same message store as Pegasus Mail and hence does not support folders within folders, so you should leave this control unchecked if you are connecting to it.
From the MercuryI help:
Client configuration
At present, MercuryI presents the Pegasus Mail message store, which does not support the idea of folders that can contain both messages and other folders: folders can contain either messages, or other folders, but not both. You may need to configure your IMAP4 client to take account of this fact - for instance, in Pegasus Mail, when you create an IMAP profile for a MercuryI server, you would make sure that the "This server supports folders within folders" control is not checked. Future versions of MercuryI and Pegasus Mail will almost certainly allow folders to contain both messages and other folders.
<blockquote> In the meanwhile, I installed Thunderbirf. There one can specify, if a new folder shall contain folders or messages. In case of creating a folder for folder, it works. This setting is missing in Outlook, or I cannot find it.</blockquote><p>PMail and Mercury foldering does not support both folders and messages in folders.
From the PMail help:</p><p><b>This server supports folders within folders:</b>&nbsp; Some IMAP servers will allow you to create mail folders inside other mail folders along with the messages they contain, while some will not. Servers that do not allow folders within folders will create trays that can contain folders, just like Pegasus Mail's standard folder view. Checking this control helps Pegasus Mail to work out how it should go about creating folders for you on the server. At the time of writing, the following common IMAP servers do support folders within folders (i.e, this control should be ticked if you are using one of these servers): Netscape IMAP Server, Microsoft Exchange IMAP Server, Novell GroupWise IMAP Server, Cyrus IMAP Server. Most unix-based IMAP servers, especially the University of Washington UW-IMAPD reference server do not support folders within folders, and hence this control should be left unticked if you are accessing one of these servers. <b>Mercury/32, Pegasus Mail's companion product, shares the same message store as Pegasus Mail and hence does not support folders within folders, so you should leave this control unchecked if you are connecting to it.</b></p><p>From the MercuryI help:</p><p>&nbsp;<b>Client configuration</b>
At present, MercuryI presents the Pegasus Mail message store, which does not support the idea of folders that can contain both messages and other folders: folders can contain either messages, or other folders, but not both. You may need to configure your IMAP4 client to take account of this fact - for instance, in Pegasus Mail, when you create an IMAP profile for a MercuryI server, you would make sure that the "This server supports folders within folders" control is not checked. Future versions of MercuryI and Pegasus Mail will almost certainly allow folders to contain both messages and other folders.
</p>