Hi Kobi,
From the description, you want to create an Outlook rule to move inbox emails to subfolders after a period of time, correct? I'm afraid there is no such Outlook rule supports what you are trying to do.
As a workaround, you can try achieving the goal via macro. Just for your reference:
http://www.slipstick.com/developer/macro-move-aged-mail/
Please Note: Since the
web site is not hosted by Microsoft, the link may change without notice. Microsoft does not guarantee the accuracy of this information.
Since we are not the best resource for coding, there is no much assistance we can provide regarding macro. If you need further assistance, I'd recommend you post a new question to the following forum:
https://social.msdn.microsoft.com/Forums/office/en-US/home?forum=outlookdev
The reason why we recommend posting appropriately is you will get the most qualified pool of respondents, and other partners who read the forums regularly can either share their knowledge
or learn from your interaction with us. Thank you for your understanding.
Steve Fan
TechNet Community Support