From Gmail Notifier Pro:
Gmail Notifier Pro is a professional Gmail notifier for Windows supporting multiple Gmail accounts. The application will display notifications when new messages arrive. It contains many easy-to-use features and settings like customizable themes, individual account settings and several options for how notifications are displayed.
Gmail Notifier Pro gives a complete overview of all unread mail in all your mail boxes and support secure Atom and IMAP protocols for mail retrieval. It will also let you write and reply to mail without opening your browser, and can be registered as your default mail handler. It also include integration with Google Contacts, scheduling, can run from USB and supports automatic updates.
Gmail thru an app instead of chrome
Able to have multiple accounts in one plate (supposedly)
Extremely slow once purchased, fine during trial
Unable to connect Google Calendar, SkyDrive, Facebook, RSS feed (Account Validation Failed) even though accts were setup correctly
Duplicates emails, doesn't delete most times
I've made several attempts to contact the supplier where the program was purchased, but have had no response (it has been several weeks). The program worked well during the trial, but you are only able to connect (2) accounts, one being Gmail and the other was Twitter. After purchasing "personal license", I have only been able to connect one other account, Feedly, anything else has "failed". This program has a lot of potential and I would gladly use as well as inform others, but at this point it has failed miserably. I'm hoping there is a glitch that they are able to correct, but I don't foresee this happening if they can't even reply to their customers.
Updated on Jul 20, 2015
I should have mentioned that I'm using version 5.3 not version 5.2.4. There really isn't much difference between the versions, but I just wanted this to be clear.
I use it for 8 email accounts, I rarely have to log on to the sites to check anything anymore. I can send, reply and read them all in IMAP right in the notifier. It even checks my non gmail accounts. Comcast and another online service.
IMAP is not standard, but it is fairly straightforward to setup. Using IMAP instead of POP3 greatly increases functionality. The purchase was a bit tricky as my mastercard was not accepted, but it was handled with an email to the developer.