Outlook stuck updating inbox
When the items in Outlook is mismatched with online version, the cached items may be corrupted.
So try to clear the offline items by following these steps: Resolution 2: Delete OST Files Outlook caches and stores email messages, calendar events and other items in Offline Storage Table (.ost) file.
It seems that when I sent the email, my line dropped.
Somehow this caused my email to go into email limbo and remain there.
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.
No new mail activities or even download progress on Inbox, but the other folders at least updating upon selecting.
If you don't choose an option on that dialog box, Outlook won't let you do anything else. Pressing Alt Tab will help you switch from window to window and help you see what dialog boxes might be stopping Outlook from responding.I can see about 23K mails when I check the synchronization through the inbox properties.And somehow, it had updated up to 15K and now nothing happens. It appears like what @RDrast has already pointed out.Give Outlook a few minutes to finish the process and it should start to work again.Outlook Email Stuck – I came across a very strange problem.
Try one of the following suggestions to fix the issue.