Google has announced that it will stop supporting Android 2.3.7 Gingerbread and below from 27 September onwards. That said, users of the aforementioned versions will no longer be able to sign in to their Google related apps, including Gmail, Google Drive, YouTube, and Google Maps. Instead, they will receive a "username or password error" notification. Users of Android 4.0 and above are safe from the new change.
According to Google, the new change is a part of the company's "ongoing efforts to keep our users safe." It's noteworthy that users who are already signed in will not be logged off the apps after the support ends. They will only be locked out if they try to sign in after logging out. As an alternative, these users can still access their accounts on the web version of the apps.
While the new announcement could come off as a problem for users of Android 2.3.7 and below, it's unlikely to cause a huge effect on many Android users today (unless you're still using the Vodafone Smart II or Motorola Spice Key XT317).