Forum Discussion
Outlook not receiving new email
What's the size of the OST file? This looks exactly like some issue with corruption of said file, which is usually caused by excessive size. RAM doesn't really matter here.
After weeks of it not working, I removed another account from the same domain from my Outlook today since it stopped updating this week, and magically, my primary account started working again this afternoon. But to answer the question:
From File Explorer: 5.68 GB (6,104,621,056 bytes)
From Outlook: 7059043 KB
5GB is a normal size, that shouldn't be a problem. Another thing you need to be careful about is the number of connections opened, which is dependent on the number of folders in a mailbox, among other things. Thus having mailboxes with dozens upon dozens of folders can also cause connectivity issues. Basically what's detailed here: https://support.microsoft.com/en-us/help/2768656/outlook-performance-issues-when-there-are-too-many-items-or-folders-in