Pushmail for Gmail worked so far solely on the Android platform, and the WM and iPhone users were forced to retrieve mail periodically, the client has to connect every 10 minutes with a gmail server to look for fresh e-mails. Pushmail, in that respect, is a lot faster and more efficient; the gmail servers send mail to the client as soon as the mail comes in.

There's no need for a special mail client to get pushmail for Gmail working; Pushmail is supported by the standard mail clients of the platforms of Apple and Microsoft.