Import more than 50 gb pst to O365

Occasional Contributor



I am planning to impirt more than 50 gb pst to office365 user having exchang eonline p1 plan & unlimited exchange online archive.


if i will import through outlook what will happen when main mailbox size reached to 50 GB Limit as per plan.


and other free tools to perform this task.

4 Replies

You will end up hitting the quota and restricted from sending/receiving messages. It's best to ingest smaller amount, say half the data, wait for the auto-expanding archiving process to move it to the archive, then ingest the remaining data.

can we import 40 gb data to online archive mailbox directly?

That depends on the tool you are using. In general, yes, you should be able to do so.

I know it is hard to import such a 50 GB huge file into Office 365 account. It is more difficult when we trying to import PST files manually. Hence, it is advised to use any good professional software available in the market to import files in your OWA account. You can try Office 365 Backup & Restore Tool to import your PST emails in your Office 365 account. It easily performs PST migration of any size of PST file. You can try this utility at your convenience. You can download it from here: