How to increase size limit for PST and OST files

Microsoft Outlook is one of the most popular email clients which is used by millions of users. It is simple to use and has very powerful options to manage your emails which are not available on the webmail of the email service providers. But most of the people don't delete the unwanted emails and the garbage emails keep getting collected in Outlook. This increases the size of the Outlook data file (PST/OST) and once the data file becomes too large in size, Outlook refuses to open it and it starts showing an error that data file is too big, delete some you the old emails to be able to see the contents of the data file.
In this situation, Outlook doesn't allow you to see any of the emails and that's why you get stuck in a situation where you can't delete any of your emails and end up losing data. But to overcome this situation, you can make a simple registry modification to be able to see your emails and even, you can store more emails in the same data file.
Follow the steps given below to do the modification in Windows registry to increase the size limit for an Outlook data file:
1. Open windows registry by running the command regedit.
2. Now, navigate to the following path in Windows registry:
Outlook 2003
HKEY_CURRENT_USER\Software\Microsoft\Office\11.0\Outlook\PST
Outlook 2007 
HKEY_CURRENT_USER\Software\Microsoft\Office\12.0\Outlook\PST
Outlook 2010 
HKEY_CURRENT_USER\Software\Microsoft\Office\14.0\Outlook\PST
Outlook 2013
HKEY_CURRENT_USER\Software\Microsoft\Office\15.0\Outlook\PST
Outlook 2016/2019/365
HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Outlook\PST
3. Now create a 32-bit DWORD by right-clicking in the right pane of the registry window and clicking on New > DWORD (32-bit) Value
4. Rename this DWORD to WarnLargeFileSize and double click on it.
5. Now set it's decimal value to 95000 (which is 95GB). Don’t set its value higher than 4090445042.
6. Now create another 32-bit DWORD and name it as MaxLargeFileSize and set its decimal value to 100000 (which is 100GB). Don’t set its value higher than 4294967295.

7. Now close the registry editor and restart your machine.
8. After restarting the machine, if you launch Outlook, you would be able to see all your emails and now the data file would be able to store up to 100GB of emails in it. More details: Click Here

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