Read all mails using Gmail API with OAuth

Question

Is there any method to read all mails (i.e. both read and unread) using Gmail API with OAuth.

The following link returns only new mails:

Answer 1

On June 25, 2014 Google released new Gmail API that can be used to easily gather messages, threads, labels and more from Gmail accounts. Service is OAuth 2 protected. They provide nice client libraries for Python, .NET and Java and wonderful documentation for those doing RESTful implementation.

I suggest using their API instead of IMAP - because Gmail has and supports many features that were not designed to run over IMAP. Features like search, tagging, etc...

You can also check their YouTube video for a nicer introduction.