Thanks for the additional information Noel, I've edited the title to add a bit more info. Do you know which version of Outlook this is? Is it 2016?
Can you please go to File > Account / Office Account and then see if it is set to automatically update. There should be an "Office Update" button in the right column, you can click it and tell it to "update now" or set it to auto-update.
Also, which e-mail provider are you using, and do you know the protocol it is connecting with (IMAP, POP, etc...). Don't worry if you don't know the latter, as I can probably find this out from the provider name.
If you have the option, can you please go to Folder > Purge > Purge Options > and then check the two boxes at the bottom:
View attachment 4685
Want to reply to this thread or ask your own question?
You'll need to choose a username for the site, which only take a couple of moments. After that, you can post your question and our members will help you out.