I previously reviewed the T-Mobile Sidekick LX 2009 and one feature I mentioned would be coming in the future that would appeal to the business customer is the support for Exchange. Microsoft purchased Danger last year so we knew there would be some Microsoft influence eventually and the new Sidekick Sync application is one major piece of that. Sidekick Sync is a monthly subscription service that runs $4.99/month and was developed by Remoba.
With Sidekick Sync you will get real time push email, attachment viewing, and full sync capabilities for your calendar and contacts. This includes meeting/event reminders, but I am not sure about creating appointments with attendees.
The Sidekick Sync application should now be available in the Download Catalog. I may try it out on an eval unit shortly and write about my experiences here for you all.