The OST files are the Outlook personal storage files. They store the emails, contacts, and calendars of an individual. OST files are a backup of the data of MS Outlook. OST file is mostly used when the user is offline or he is using a different client. In that case, the data is synced with the OST files. OST files are used to export the Outlook data to Outlook PST.

However, at some point in time, you might want to convert OST files to PST files. For this, you can refer to this informative article that explains the multiple ways to convert OST to PST format.

Manual Methods

• Export Outlook Mailbox Data to PST – Using MS Outlook
• Enable the Auto Archiving option to Convert OST file to PST

However, these manual methods have certain limitations that induce the demand to opt for the secure and reliable OST to PST Converter. This article will also introduce you to such an advanced utility.

One of the most prominent ways to transfer your Thunderbird data to Outlook is by exporting it in PST format. For this, you can use the advanced software approach. In this respect, I have recently gone through an informative article that helped me to export Thunderbird emails to Outlook PST. Apart from this, it discusses the two effective approaches that you can utilize for Thunderbird to Outlook Migration. The manual method consists of the following two stages.

1. Save Thunderbird emails to EML format.
2. Import EML files into your Outlook Account.

This manual approach is only suitable in case you have a few Thunderbird emails. However, for the entire migration, you can choose an advanced Thunderbird Backup Tool. This utility will allow you to back up or export your Thunderbird data into PST, CSV, EML, EMLX, PDF, and various other file formats. You can also migrate your data directly to the most popular email service providers such as Gmail, Yahoo, Office 365, Hotmail, iCloud, and other IMAP-supported email clients.

@alberttaylor Yes, I agree with the fact that we should opt for a secure G Suite (Google Workspace) Backup Tool. In this respect, I have recently opted for an advanced and secured Google Workspace Backup Software that helped me to directly migrate my G Suite emails to Office 365 admin center. The additional benefits of such utilities are that they offered some extensive features that allow us to optimize the resultant data by ensuring high data security.