How to Set Up Offline Gmail on Your Chromebook
It’s dead simple to access your Gmail even if you’re not connected to the Internet. All you need to do is download and install the Gmail Offline app and set your Gmail account to support cached emails (as well as a cached version of your address book and recent attachments). Here’s a step-by-step on how to set up Offline Gmail for your Chromebook.
1. Click the Search icon.
2. Type "Gmail," and open Gmail.
3. Click the Gear icon in the upper right corner.
4. Select Settings.
5. Select Offline from the list of tabs.
6. Select the Add To Chrome button after the Chrome Store opens. If Add to Chrome isn't there, it's already installed.
7. Hit Add app.
8. Click the Search button.
9. In search, type "gmail offline" and open Gmail Offline.
10. Select Allow Offline Mail and tap Continue.
Offline Gmail launches a split-screen view of your inbox. This is the inbox view you’ll see when you open the app, whether you are online or off.
How to use Offline Gmail
If you want to compose a message, select the Pencil icon above the Inbox.
Your address book is cached, so a list of recipients will autocomplete in the To:, CC: and BCC: fields, similar to using Gmail online.
Hit Send after you compose your message.
When you connect to the Internet again, the message will send automatically. You can confirm in your Sent folder.