Making email migration an easy ride ™ - time after time!

How to split PST file during EML to PST conversion?

How to split PST file during EML to PST conversion?

The volume of data coming from everywhere constantly grows, the same for the Outlook PST data file. Many emails every day, a lot of attachments, forwards and replies. However the PST size is limited by Microsoft by default and so you may face with the problem when Outlook stops working. For example the Outlook 2002 PST file size is limited by 2 GB, Outlook 2003-2007 PST file size is limited by 20 GB. Modern versions of MS Outlook 2010 and above are limited to have PST files not more than 50 GB in size. But what if you should import tons of EML files?

In all new versions of Outlook Transfer products (5.2 and above) we have implemented the output PST splitting option especially for those who need to maintain the PST file size. Now you may use the “Split Output PST File” menu to enable one of the predefined “Volume size …” options to split PST file on several smaller parts while converting the EML to PST or migrating from other email clients to Outlook.

Option - Split Output PST File and Volume Size

How the PST splitting works:

We will review it on example of EML to Outlook Transfer tool…

  1. Run the EML to Outlook Transfer utility
  2. Use menu “Mode” to select “Save to PST file” option
  3. Use menu “Options” > “Split Output PST File” and select the desired size of the PST file part (volume)
  4. Use menu “Options” > “Target Outlook Folder” if you want to pre-select the target Outlook folder
  5. Specify or select the source folder where your source EML files and folders are stored
  6. Press “Scan Folder” button to scan the nested subfolders
  7. Press “Save PST” button to start the EML to PST conversion

The Outlook Transfer tool will write all imported data into several PST files with number in the file name for each PST part. You may open each PST part separately in Microsoft Outlook using menu File > Open > Open Outlook Data File…

When you working with huge data arrays of data you may also want to save / load option of the Email Containers list. This functionality allows you to interrupt the data conversion and then continue it from the same moment.

Other Tutorials

How to Transfer EML Files to Outlook

EML to Outlook Transfer – Usage Instructions Email conversion of any sort is quite often a complex process that involves a great number of dependency and format compatibility checks, implies a…

IncrediMail to Mailbird Migration

Article describes how to convert IncrediMail contacts and emails into Mailbird email client. Mailbird is modern messaging application which allows to use multiple accounts to manage emails, supports the GUI…

How to Transfer Mac Mail Emails to Outlook

Mac Mail to Outlook Transfer – User’s Manual In this article, we will show you how to convert your entire Mac Mail email archive to Microsoft Outlook on a PC…

How to Use Data Extraction Kit for Outlook

Data Extraction Kit for Outlook is a powerful all-in-one tool for Outlook/PST email conversion, migration and data analysis. The product can be used for extracting emails and other objects from…

How to export Gmail emails to Outlook PST file?

Gmail to Outlook Transfer – User’s Manual Gmail to Outlook Transfer (click here to download) is a highly efficient specialized tool for transferring the contents of online Gmail folders and email…

How useful was this post?

Click on a star to rate it!

Average rating 4 / 5. Vote count: 3

No votes so far! Be the first to rate this post.

As you found this post useful...

Follow us on social media!

We are sorry that this post was not useful for you!

Let us improve this post!

Tell us how we can improve this post?


I face the problem that I need to transfer a huge *.box file [65 GB – ca. 190k items] into a *.pst file. The above explained way for splitting does not work.

Any recommendations?

This article describes PST splitting during the EML to PST conversion. It is not about the BOX splitting. Please contact our support team with that question, they will be happy to assist.

Leave a Reply


How to split PST file during EML to PST conversion?

time to read: 1 min