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How to split a .pst file in Outlook?

After a long time working with Microsoft Outlook, the .pst file of certain email account may be very huge. In this case, we can split the big .pst file into several files. Here I will introduce a way to split a .pst file with the Archive feature in Outlook.

Part 1: Change archive criteria with changing registry form

Part 2: Split a .pst file with Archive feature

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arrow blue right bubblePart 1: Change archive criteria with changing registry form

Before manually splitting a.pst file opening in Outlook, you need to change the registry form, and make your Microsoft Outlook archive by received time.

Step 1: Press the Win + R keys at the same time to open the Run dialog box, enter the regedit in the Open box, and then click the OK button.

Step 2: In the coming User Account Control dialog box, click the Yes button.

Step 3: Now you open the Registry Editor, open the Preferences folder with following paths:

Outlook 2013: HKEY_CURRENT_USER\Software\Microsoft\Office\15.0\Outlook\Preferences
Outlook 2010: HKEY_CURRENT_USER\Software\Microsoft\Office\14.0\Outlook\Preferences
Outlook 2007: HKEY_CURRENT_USER\Software\Microsoft\Office\12.0\Outlook\Preferences

Step 4: Click the Edit > New > DWORD (32-bit) Value, and then name the new DWORD as ArchiveIgnoreLastModifiedTime.

Step 5: Double click the DWORD of ArchiveIgnoreLastModifiedTime, change value data to 1 in the Value data box, and click the OK button in the Edit DWORD (32-bit) Value dialog box.

Step 6: Close the Registry Editor, and restart Microsoft Outlook.

arrow blue right bubblePart 2: Split a .pst file with Archive feature

Now you can split an opening .pst file by specified date with the Archive feature easily in Microsoft Outlook. And you can do as following:

Step 7: Create a new Outlook Data File with clicking the New Items > More Items > Outlook Data File on the Home tab.

Note: In Outlook 2007, you need to click the File > New > Outlook Data File, and then select the Office Outlook Personal Folders File (.pst) and click the OK button in the New Outlook Data File dialog box.

Step 8: In the Create or Open Outlook Data File dialog box, enter a name for the new .pst file into the File name box, open a folder where you will save this new .pst file, and click the OK button.


Note: In Outlook 2007, it will popping up the Create Microsoft Personal Folders dialog box, just click the OK button without entering password.

Step 9: Click the File > Info > Cleanup Tools > Archive in Outlook 2010 and 2013 (or click the File > Archive in Outlook 2007).

Step 10: In the coming Archive dialog box,

(1) Check the option of Archive this folder and all subfolders;

(2) Click to select the account name whose .pst file you will split;

(3) In the Archive items older than box, enter or select a certain date that you will split the .pst file by;

(4) Click the Browse button.

Step 11: In the opening Open Outlook Data Files dialog box, find out and select the .pst file which you will split the original .pst file to, and then click the OK button.

Step 11: Click the OK button in the Archive dialog box.


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    Sandra · 1 years ago
    The above shared information is very useful and informative. Few days back, I was also stuck in the situation where I was required to split my PST file by date. Then someone suggested me to use [b]SysTools Split PST[/b] software which can split the PST files with four different splitting options: by date, size, year, and folder. I found this tool very efficient and reliable as it is capable of splitting large number of PST files easily.
  • To post as a guest, your comment is unpublished.
    james snow · 2 years ago
    Recently I had used sysInfo PST Split Tool and i was suprised by the result. With that tool I managed to split my PST files in few seconds.
    i would really recommend the tool who are in need of cost-effective. ultra-fast and reliable PST Splitter.
  • To post as a guest, your comment is unpublished.
    JasonBates · 2 years ago
    However, this article is informative but I have no prior experience of manual troubleshooting. So, I want to give a chance to free demo of Stellar Phoenix PST File Splitter.
  • To post as a guest, your comment is unpublished.
    AlexD · 3 years ago
    Nice article can share here, this article information solve my PST file Splitting problem. I can recommended to all users to try to use this technique.
  • To post as a guest, your comment is unpublished.
    poonam · 3 years ago
    Apart from this you can use any third party solution to split your PST files. I would like to suggest you SysInfoTools PST Splitter Tool.