So I have a BES server with version 4.0.2.8 and I want to update it to the latest releases. Do I have to install service pack 3,4,5,6 and then 7 or can I just skip right to service pack 7?

Any help would be appreciated.

Thanks

You can install SP7 straight away.
It contains the fixes from the previous service packs.

As a side note... you probably want to consider going to 4.1 now.
BES 4.0 is end of life and is no longer supported by RIM.

Do you know how much BES 4.1 costs?

It's free if you have an active T-Support maintenance agree with RIM.
Otherwise it's about $3000.

One-time Upgrades
BlackBerry Enterprise Server v4.1, Service Pack 5 Version Upgrade $999
See the link for exchange

BlackBerry - BlackBerry Enterprise Server for Microsoft Exchange

Thanks for the quick responses and all the help.

Do you know if Service pack 7 allows for meeting requests to get sent to the hand held devices?