Users regularly experience Outlook inbox not updating when using the Microsoft Outlook email client on Windows.
Numerous elements, including the following,can hinder Outlook's performance and prohibit the emails from updating automatically:
Poor internet connectivity.
Defective or unworkable add-ins.
Wrong email settings.
Conflict with other applications.
A corrupt or damaged Outlook profile.
Extensive local cache (.ost).
Outlook data file that is Inconsistent (.ost).
Low local drive storage or mailbox storage .