Outlook 2016 not showing all emails

Hi,
I have Outlook 2016 not showing some old emails in specific folder, which are visible fine in OWA.
We use Exchange  2013.
Folder shows "sync complete".
How can I fix this?
Thank you!
Armitage318Asked:
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Alex GreenProject Systems EngineerCommented:
MFCMAPI and check if anything is hidden

https://www.howto-outlook.com/howto/hidemovedeletemfcmapi.htm
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Alex GreenProject Systems EngineerCommented:
Oh on a more simple note, can you rename the OST file for that profile and then download it all again?

Oh size of the OST would be good too, anything above 50GB is an issue
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Michael B. SmithManaging ConsultantCommented:
This is almost always due to a custom view.

Click on View -> View Settings -> Current View

Clear the Filter condition.
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