I am a new blackberry user and have a question regarding email push frequency. I have set up my webmail for work to be pushed to my phone however it is not instant. It seems to check it every 15 minutes. Can this be changed?

No, that is the way it works on BIS. If it finds mail, it will try again in 2 mins, if not, back to 15.

There are workarounds, such as using a gmail forwarding (gmail and yahoo are instantaneous).

AND, welcome to the Forums.