Increase the sync slider to download older emails

You can increase the time in your email account's offline settings so that more or all your emails are cached locally for indexing. To do this:

1. Start Outlook.
2. Click File > Account Settings > Account Settings.
3. On the Email tab, select your email account and click Change.
4. Drag the Download email for the past: slider to the desired amount of time or to the far right to All.
5. Click Next, and then Done. Close out the window and restart Outlook.