Outlook hangs on updating inbox
However, such software or a professional Outlook add-ins are not reliable and can lead to improper functioning of the Outlook.
The Outlook is designed to archive Inbox emails to reduce the mailbox size.
Run Scan PST repeatedly, until it reports that there are no more errors.
also manually restart the information store service!
Well this was a very well known issue as the title explains but in my case, the "updating inbox 3.99GB" keeps on repeating to the same state.
Microsoft is aware of this issue and provides a tool to fix it – Inbox Repair tool (scanpst).
Follow the steps listed in that Microsoft Knowledge Base article to run Scan PST. Important: In many cases, Scan PST requires more than one pass to fix a corruption.
2] Disable hardware graphics acceleration for Outlook and see if this helps.