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Importing your Outlook OST files to your Office 365 account manually can be a bit tricky. First, you'd need to convert the OST files to PST format, which requires using the Import/Export feature in Outlook. This involves creating a new PST file and then copying everything from the OST file to the PST file. Once that's done, you can then upload the PST file to your Office 365 account. But this process can be complicated, especially if you have lots of files or if something goes wrong during the conversion.

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!