Migrating to Office 365 from on-premises Exchange requires proper planning and management. The process for mailbox migration – cutover, staged or hybrid – is also decided based on the number of mailboxes.
But, a problem arises when the Exchange Administrator needs to export mailboxes data locked inside OST files; meaning, those OST files that don’t have the associated mailbox profile on Exchange, and there are unsaved data in the OST. Mailboxes stored in such OST files cannot be imported in Office 365 – as they are simply a cache of the mailbox on the server and thus can’t be opened without Exchange & associated profile – unless there’s a way to extract OST file to PST , Office 365 or another accessible format.
This blog post shares the method to help you import an OST file into Outlook 365, overcoming the inherent challenges which may hinder the migration process. Care should be taken in assessing the right migration method because in most cases, manual techniques may not work as per expectations, thus resulting in disrupted business continuity.
Let’s check the methods to import an OST file to Office 365:
Method 1: Convert OST files into PST and upload to Office 365
This is an indirect method which involves two steps:
Note: Provide necessary folder or file permissions to import the PST file to Office 365 format. You can also copy the files or folders directly to PST file, available on Network Path.
Method 2: Convert OST files into PST format and drive ship PST files to Office 365
This is also an indirect method which involves two steps:
Through “Drive Shipping to Microsoft” , users upload their PST files to a hard drive and send the drive to Microsoft. Microsoft copies and uploads the data from a disk drive to Office 365.
Method 3: Import OST to Office 365 by using Stellar Converter for OST Technician
This is a direct method that involves exporting the converted OST files directly to Office 365 accounts. This method helps you to export your offline Outlook data .ost to Office 365. You don’t need Exchange server connectivity to perform this method.
The following steps help in effective migration:
Note: This option also helps you to select the desired data if you do not want to import the entire data of OST file
Office 365 offers a plethora of business apps along with Outlook email client, thus making it more useful to perform business operations. Also, Office 365 is managed by Microsoft, thus relieving the organization from managing the application and the Exchange server.
This free technical guide highlighted the manual methods and the software-based method to import OST to Office 365, along with a comparison of the methods. Based upon the comparison, it can be inferred that the manual techniques are complex, tedious and may not produce the expected results.
Alternatively, Ost to Office 365 converter tool the software-based import method – outlined for Stellar Converter for OST – is more convenient and precise by virtue of its DIY interface. Users can import the OST files directly in Office 365 by using the login credentials. Also, the software helps retrieve deleted items from the mailboxes.
Eric Simson is an Email Platform Consultant and is associated with Stellar Data Recovery from last 6 years. He writes about the latest technology tips and provides custom solutions related to MS Outlook, MS Exchange Server, Office 365, and many other Email Clients & Servers.