Blackberry users love email, and those who don't probably wish they had an iPhone. RIM's primary advantage over the years has been dynamite push email services, but as any Gmail user will tell you, support for Google's free email service has been somewhat lacking. Push support allowed users to retrieve Gmail messages, but when they got home to check their inboxes the old fashion way, anything read on the Blackberry was still marked as un-read even with IMAP enabled. Gmail users simply had no way to label or organize messages on the go. This was a frustrating limitation, but luckily for Blackberry Gmail users, this is all set to change.
RIM has confirmed plans to upgrade its North American BIS servers from 2.8 to 3.0 on Sunday March 28th, and along with a slew of other compatibility updates, support for 2-way Gmail sync as well as labels will be added. The BIS servers are the secret sauce hosted by RIM which allows up to 10 email accounts to be pushed to a single device. This allows mobile users to drastically reduce the amount of data the phone needs to transmit in order to conduct common tasks such as forwarding and opening email attachments.
Blackberry push email service will be disrupted between 2AM and 6AM EST as a result of the upgrade, but if you're a Gmail user on a Blackberry, it's a small price to pay.