To merge multiple PST file into single, if you want to merge two or more than two (multiple) Outlook PST file into singe file of any versions of MS Outlook, try Merge PST tool that allows to slecting multiple PST file to merge or combine them into single PST file format without any loss.

https://goo.gl/Xf5Pnu


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Download PST Merge Software to merge Outlook contacts, emails, calendars, journals and other email items into single PST file. This effective PST Merge tool merge PST file by three option- Merge PST file, Join PST files and Merge Contacts. This PST Merge Software supports all version of MS Outlook including the latest Outlook 16 and is compatible with all the versions of Windows.

To know the manual steps of PST Merge Software visit here: Use of PST Merge Software
 

MS Outlook uses PST (Personal Storage Table) file format to store your mails and other mailbox items. There is a limited size of PST file and if it exceeds that size limit, then the file becomes corrupted.Microsoft outlook does not provide any facility to directly split large pst file into small pst file.  

MS Outlook uses two types of PST files, one is ANSI PST and the other is Unicode PST.

1. The ANSI PST file format has a size limit of 2 GB and was used with MS Outlook 2002 and earlier versions.

2. Unicode PST file provides up to 20 GB size limit, which is used with MS Outlook 2003 and its later versions.

Heavy and Oversized PST contributes equally in making PST management challenging. As size of PST increases more than its limitation then users have to face lots of problems.Outlook users need to manage their PST file size properly time to time. Reduction of PST files size necessary for better file management. But as you reduce PST file size, there would be possibility of data loss.

Don't Worry Reduce PST file Size without any loss!!

Splitting a pst file can be done wtih Archive feature in Outlook. But split through archives prcoess can take yearly (or any other amount such as quarterly, or every 2 years.

I've had the same problem with oversized PST some time ago, so I found best Split PST Tool – Split Large PST Files into Small Ones divides PST file into manageable and smaller PST files as per the specific criterion like size, date, folder and email id, and protects them from any corruption issues because of file size limits.Performs risk-free operation of PST file splitting without making any change on the content or structure of original PST file and the original formatting or RTF and HTML messages.
 
{ Also available in Corporate License and Home User’s License }

Download now : http://www.mannatsoftware.com/stellar-phoenix-split-pst.html








 

If you have multiple PST files and you want to merge them in one PST file, try PST Merge tool to easily complete this task with simple mouse click. It supports both ANSI and UNICODE PST file and merge mulple PST files in one PST file without any data loss.

https://www.g2crowd.com/products/merge-pst-tool/details

If you're using Outlook Email client application where all your email saved in PST or Personal Storage Table file format then these two thechnique Split and Merge will definitely help you to come back from two major issues:

1. When have large size Outlook PST file.
2. When have large number of Outlook PST file in Outlook account to access.  

Split Technique: This technique will help you to break large size size Outlook PST file in some small PST files so that user can use data of large size file easily. 
Merge Technique: It will allow user combine and merge large number of Outlook email files in one single file.

You can take more information about both two technique from the link: Split and Merge Outlook PST file