Restore emails into ost file without any data loss

You can try these steps:

Close your Outlook account and log out.
Click or double-click Mail in the Control Panel.
Show Profiles can be found in the 'Mail Setup – Outlook' dialogue box.
Select your current (existing) profile from the 'Mail' dialogue box, then Properties.
Select Email Accounts from the drop-down menu.
From the Email tab, choose the Exchange account and then click Change.
Select More Settings after unchecking the 'Use Cached Exchange Mode' item.
Select Offline Folder File Settings from the Advanced tab.
Click the Disable Offline Use button in the 'Offline Folder File Settings' box.
If prompted, select Yes.
Click the Offline Folder File Settings button once again, then OK.
Yes, it should appear in the pop-up box.
Under 'Cached Exchange Mode Settings,' choose the 'Use Cached Exchange Mode' checkbox, click OK, and Next.
The finish is the option.

Regards,
J Wick

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