Hii, for exporting Office 365 to PST I would suggest you DRS Export Office 365 to PST Tool which is a very reliable tool for the users. This tool maintains your account space. You can save your valuable information without harming your data loss.
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Steps to Export Mailboxes from Office 365 to PST are:
Step 1: Login using Office 365 Admin/User account.
Step 2: Select mailbox to export as PST.
Step 3: Choose Category & set Date Filter.
Step 4: Browse target to save PST file.
Step 5: Click Export to begin the process.
Hope This Works,
Peter