I can’t understand why Gmail Android app don’t have an option to make all unread emails mark as read at once in the inbox. The only option currently available is to select them one by one and mark those as read. Don’t think that this is because of a technical reason but it is a design decision. Many people use Gmail only on their mobile now a days, this option should be there. I asked them in Twitter before about this but did not get any proper reason.
Email is still the most popular way of communication throughout the world. The most popular email for personal use is Gmail and for enterprise use is Exchange and Outlook. Outlook is basically an email client. It has many features which are good in comparison with Gmail. One particular thing is email thread structure.
In this mobile first world everyone wants to configure email in their phone. The most important advantage to have email in phone is, you can check and reply your important email on the go. Gmail is the most popular personal email service currently. You can configure Gmail into your Windows Phone also.
If someday you can not find your mails, please make sure you check the other tabs also.