It might be a little challenging to manually
import your Outlook OST files to your Office 365 account. The OST files must first be converted to PST format, which calls for the use of Outlook's Import/Export function. To do this, make a new PST file and copy all of the contents of the OST file into it. You may then upload the PST file to your Office 365 account when that is finished. However, if you have a lot of files or if the conversion goes wrong, this procedure might get problematic.
However, there's an easier way! You can use a tool called
Cigati OST to Office 365 Migration Tool. This tool does all the hard work for you. You just need to select the OST files you want to move and provide your Office 365 account details. The tool takes care of the rest, ensuring a smooth and error-free migration. It's super easy to use and saves you a lot of time and hassle. So, if you want to import your Outlook OST files to Office 365 without any headaches, give Cigati OST to Office 365 Migration Tool a try!