If Outlook isn't sending emails, it may be offline (they may be staying in your Outbox). The steps below will help you check if it's offline or not, and take it back online.
Before following the steps below, it's worth being sure you're connected to the Internet. If you're unsure, go ahead and open a website such as bbc.co.uk and check it loads okay. If it does, then go ahead and follow the steps below.
Taking Outlook Online
Follow these steps to check if Outlook is offline, and if it is, take it back online.
1. Open Outlook (if it's not open already).
2. In Outlook, if it's in Offline mode, it will say "Working Offline" at the bottom right in the status bar.
Offline Mode Status Bar
This shows what it might look like in Outlook for Mac 2016 (yours may look slightly different):
Online Mode Status Bar
Otherwise, if it is in Online mode then it would say something like "Connected to...".
If it doesn't say it's "Working Offline", it may be attempting to connect, and it could be a connectivity problem. You could check if other devices on your network are able to send and receive emails.
3. Select the "Tools" tab in the toolbar at the top of the Outlook window.
4. Look for the "Online/Offline" switch, which should be on the "Offline" setting as shown here:
Offline Mode Setting in "Tools" Toolbar
5. Switch it to "Online" mode so that it looks like this:
Online Mode Setting in "Tools" Toolbar
6. Check you can send and receive emails.
Hopefully you're back online, and the problem's solved. However, if it isn't, get in touch with our help team to look further into it for you.