I'm asking this question because I got curious about an email I'm sending from the office with Outlook using the Delay delivery option. When I searched for that mail at home to modify it on Outlook, I couldn't find it.

Are emails stuck inside the Outbox folder (as is the case of a Delay delivery email) local to the machine where they were sent? and if possible where are these mail stored physically (path to a file)?

Besides, if these emails are stored locally, does it mean that Outlook in this case is using POP protocol instead of IMAP (where emails would be synchronized from a remote server)?


You're right. For IMAP accounts Outlook stores Outbox locally in .OST cache file. You can find the path to this file in Outlook account options (Data Files tab).

  • I guess it's impossible to make this file synchronized between different mail clients on different machines, isn't it? – Hakim Jun 8 '16 at 15:07
  • 1
    You're right again... unfortunately. – thims Jun 8 '16 at 15:51
  • Can I extract EMLs from OST file (Draft and Outbox folder) or convert OST to PST file ? – Kiquenet Jan 18 '17 at 7:43

When unchecking 'Used Cached Exchange Mode' in Outlook 2013 in File>account settings>Data Files tab>settings>advanced tab I found that my mail with Delayed delivery did get synched to the server. I saw it pop up in my outbox in Outlook on another workstation. Ofcouse be aware of any drawbacks unchecking 'Used Cached Exchange Mode'. (I'm still checking which :)

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