As the world continues to move everything online, web-based e-mail services continue to grow in relevance with each passing day. Most mobile phones now support accessing your e-mail, allowing people to check their e-mail from pretty much anywhere. As a result, the web-based e-mail wars have heated up a little bit.

While to date Yahoo! Mail still boasts more users that its biggest competitor, over the past 3 years GMail has become the standard when it comes to web-based mail services, surpassing Yahoo! Mail as the web-based mail service of choice by most power users.

For me, the variety of options GMail gives, the sorting it does with my replies, and the fact that all the features are free is what keeps me there. With that said, there is no doubt that Google became content with their web-based mail service, as the innovation disappeared, presumably to apply their resources to other projects they have in the works. In the meantime, Yahoo! Mail has continued to improve their web-based e-mail service, and taken their innvoation to a new level.

Lifehacker has written a great post comparing Yahoo Mail vs. GMail, where they take a close look at both services and compare what they both have and in what areas each service is clearly superior. With mail fetching and all the other tools we have today, it has become increasingly easier to switch e-mail addresses, making it beneficial to try out other services and find what works best for you.

I’ve kind of felt all along that GMail appeals more to power users and people that spend a lot of time online, while Yahoo’s mail service is targeted more towards the occasional user. In appearance alone, they are completely different. Yahoo trys to give their software the appearance and many of the features of Microsoft Outlook, probably to ease the transition of people that use Outlook at home or at work. GMail has a Google-style look about it that is nice and unique, yet is very simple (which is how Google has made their name up until this point). I also see a lot of debates over folders vs labels.

So, which web-based e-mail service do you use and why do you prefer it? Sound off in the comments below!