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I have a user that is complaining that his outlook is slow when working remotely. He uses a PST file as well as a connection to Microsoft exchange. The PST is stored on a file server. How does Outlook deal with the PST?

Does Outlook open the remote PST file or does it download a copy of it into a temp directory and deal with it there, or maybe just download it and hold it in memory?

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  • It opens the file, in the location the file is located, copying the file doesn't make logical sense.
    – Ramhound
    Commented Apr 8, 2016 at 13:37
  • By opening it, it's going to have to download the whole thing into memory then?
    – Simkill
    Commented Apr 8, 2016 at 13:39
  • No, a PST is a specialized container with structure. (Much like a .zip)
    – Tyson
    Commented Apr 8, 2016 at 13:50
  • So, how does it work then? I mean, when you double click a zip file, if it's large and remote, it doesn't just open, there's a period of time where it thinks about it. This guy's PST is 17gb and he's trying to open it over an ADSL2 connection.
    – Simkill
    Commented Apr 8, 2016 at 14:07

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Outlook opens the remote PST. But please don't ever use non-local PST files! This leads to corruptions, interruptions and other negative effects. Please don't do it!

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