An error occurred while saving the commentRob Lee commented
I would like to share my experience with this issue.
I have tried PowerShell as well as an automated solution to export Exchange Online mailbox to PST.
According to my personal experience, I would like the viewers to go for an automated solution as it's cost effective as well as time-saving approach.
I used SysTools Office 365 Backup & Restore tool for this purpose. The link to the site is: