'Outbox' is a specifically named folder in ''Local Folders' and it has a specific function to store all preprepared outgoing messages which have been selected to be sent using 'Send Later' option. I would recommend that you do not use the term 'Outbox' for a general storage folder. Outbox would be an incorrect terminology for items that are actually 'Sent'. 'Outbox' is items not sent, but prepared to send. 'Draft' is for items being composed and not 'sent' nor 'prepared to send using 'send Later'. 'Templates' is for emails that are generic or used frequently. One's which you have precontructed ready for use with eg: Mail Merge. I also have one preprepared with a table, so I do not have to keep creating that table each time. 'Sent' is specifically used for items that have been sent, not being composed, not waiting to be sent, but actually sent. 'Inbox' is also a specific term used for the 'Inbox' for incoming new messages for a particular mail account. I would recommend that you do not choose to use identically named folders as subfolders in a user created folder for storage. I would strongly recommend that you do not use any of the default naming terminology for general storage of emails. You may choose to create new folders for any topic for organising, but not everyone would appreciate automatic subfolders especially with pre-chosen names that are used elsewhere for very specific purposes. I for one would not appreciate a presumed storage system and then need to delete and/or rename a load of incorrectly named folders. The current system is designed to allow anyone to create a file structure which suits their needs. It can become very confusing when trying to work out from a backup which folder is which when they share identical names. As a helper on this forum, I am aware of how many people choose to store emails as I assist in backup and recover instances. Most people do one of the following with sent items. All sent mail is kept in the mail account 'Sent' folder. But some people, in addition, prefer some mail which is created from a 'Reply' to be kept in same folder as the initial email. This option can be enacted in Account Settings. This means it can be useful in threading. It also keeps incoming and outgoing emails in same topic. This is why there is a 'Correpondents' column header. It is used in folders where incoming and replies are stored in same folder. If you are creating folders for sent emails in all general storage folders of your choice, which does not relate to emails eg: Replies then this ends up being a manual or filter job. Either way, it consumes time. You still cannot use them in threading unless you open an original email using 'Open message in conversation', which also works if you put everything in 'Sent'. Your method suits you, but it would not necessarilly be suitable for many others. But please heed what I say about using incorrect naming terminology and not using default folder names for folder topics nor their subfolders.