Can't find my Outlook .pst files


Madrona

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Windows 11
I recently installed Outlook as part of an MS Office 2021 Professional Plus suite. I synced my emails from a GMX.com email account using IMAP.

After a few weeks, when I looked for my Outlook data files in the account settings, I noticed they were .ost files, not .pst files. I then checked my Users folder under Documents/Outlook and the folder is empty.

Then I went to the users folder and looked under appdata>local>microsoft>Outlook folder and the email files are in .ost.

I'm confused, doesn't Outlook create .pst files (from .ost files?) and store them locally somewhere as .pst files?
 

My Computers

System One System Two

  • OS
    Windows 11
    Computer type
    Laptop
    Manufacturer/Model
    Lenovo T16 AMD Gen 2
  • Operating System
    Windows 11
    Computer type
    PC/Desktop
    Manufacturer/Model
    Old HTPC custom build (2009)
    Memory
    8GB
    Graphics card(s)
    onboard
I recently installed Outlook as part of an MS Office 2021 Professional Plus suite. I synced my emails from a GMX.com email account using IMAP.

After a few weeks, when I looked for my Outlook data files in the account settings, I noticed they were .ost files, not .pst files. I then checked my Users folder under Documents/Outlook and the folder is empty.

Then I went to the users folder and looked under appdata>local>microsoft>Outlook folder and the email files are in .ost.

I'm confused, doesn't Outlook create .pst files (from .ost files?) and store them locally somewhere as .pst files?
You only create .pst files manually (for exporting or backing up your files).
 

My Computer

System One

  • OS
    Windows 11 Pro + Win11 Canary VM.
    Computer type
    Laptop
    Manufacturer/Model
    ASUS Zenbook 14
    CPU
    I9 13th gen i9-13900H 2.60 GHZ
    Motherboard
    Yep, Laptop has one.
    Memory
    16 GB soldered
    Graphics Card(s)
    Integrated Intel Iris XE
    Sound Card
    Realtek built in
    Monitor(s) Displays
    laptop OLED screen
    Screen Resolution
    2880x1800 touchscreen
    Hard Drives
    1 TB NVME SSD (only weakness is only one slot)
    PSU
    Internal + 65W thunderbolt USB4 charger
    Case
    Yep, got one
    Cooling
    Stella Artois (UK pint cans - 568 ml) - extra cost.
    Keyboard
    Built in UK keybd
    Mouse
    Bluetooth , wireless dongled, wired
    Internet Speed
    900 mbs (ethernet), wifi 6 typical 350-450 mb/s both up and down
    Browser
    Edge
    Antivirus
    Defender
    Other Info
    TPM 2.0, 2xUSB4 thunderbolt, 1xUsb3 (usb a), 1xUsb-c, hdmi out, 3.5 mm audio out/in combo, ASUS backlit trackpad (inc. switchable number pad)

    Macrium Reflect Home V8
    Office 365 Family (6 users each 1TB onedrive space)
    Hyper-V (a vm runs almost as fast as my older laptop)
.Pst files are automatically created when an email account is set up as a POP account. .Ost files are automatically created when an email account is set up as an imap account.
For .pst files the default location of your email account data file is your Outlook sub-folder within your documents user folder.
Only .ost files will show up in appdata.
 

My Computers

System One System Two

  • OS
    Windows 11 Pro 24H2 26100.3775
    Computer type
    PC/Desktop
    Manufacturer/Model
    Dell Optiplex 7080
    CPU
    i9-10900 10 core 20 threads
    Motherboard
    DELL 0J37VM
    Memory
    32 gb
    Graphics Card(s)
    none-Intel UHD Graphics 630
    Sound Card
    Integrated Realtek
    Monitor(s) Displays
    Benq 27
    Screen Resolution
    2560x1440
    Hard Drives
    1tb Solidigm m.2 nvme+256gb SKHynix m.2 nvme /External drives 512gb Samsung m.2 sata+1tb Kingston m2.nvme+ 4gb Solidigm nvme
    PSU
    500w
    Case
    MT
    Cooling
    Dell Premium
    Keyboard
    Logitech wired
    Mouse
    Logitech wireless
    Internet Speed
    so slow I'm too embarrassed to tell
    Browser
    #1 Edge #2 Firefox
    Antivirus
    Defender+MWB Premium
  • Operating System
    Windows 10 Pro 22H2 19045.3930
    Computer type
    PC/Desktop
    Manufacturer/Model
    Dell Optiplex 9020
    CPU
    i7-4770
    Memory
    24 gb
    Monitor(s) Displays
    Benq 27
    Screen Resolution
    2560x1440
    Hard Drives
    256 gb Toshiba BG4 M.2 NVE SSB and 1 tb hdd
    PSU
    500w
    Case
    MT
    Cooling
    Dell factory
    Mouse
    Logitech wireless
    Keyboard
    Logitech wired
    Internet Speed
    still not telling
    Browser
    Firefox
    Antivirus
    Defender+MWB Premium
Ah, that's where my confusion lay. I thought .pst files were permanent local files created from .ost files (which I thought were just cache files).

I want to migrate my Outlook files to Thunderbird.

So does that mean I'll have to first convert the .ost files to .pst files and in turn, convert to MBOX files?
 

My Computers

System One System Two

  • OS
    Windows 11
    Computer type
    Laptop
    Manufacturer/Model
    Lenovo T16 AMD Gen 2
  • Operating System
    Windows 11
    Computer type
    PC/Desktop
    Manufacturer/Model
    Old HTPC custom build (2009)
    Memory
    8GB
    Graphics card(s)
    onboard

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