Through Gmail, you can not only send and receive emails, but you also can store messages as well as search for specific messages. With Gmail, successive messages that are related to each other will be automatically organized into one conversational thread

The Google Gmail service stores messages in an archive for future viewing, and it's easy to restore these messages to the Inbox. To view the emails that are archived, access the All Mail label. From there, you can put archived Gmail messages back in y

However, Gmail automatically erases the trashed emails after that month. So have you accidentally archived or deleted a number of Gmail emails that you now need to open? If so, this is how you can recover them. Recover Archived Gmail Messages via All Mail