An iconic teenage smartphone, the Sidekick, is getting all grown up and professional as it receives full push e-mail service through a Sidekick Sync app today. The Sidekick LX ’09 was promising Exchange ActiveSync at launch, and now for $4.99/month, you can get push e-mail, synced contacts, calendar items, and all the usual corporate Exchange goodies. This small step really makes the Sidekick viable for business – hopefully it can shed the adolescent stigma in good time. If you’re packing one of these, check out the Download Catalog for the app, but if you’re looking to pick up a Sidekick LX, you can nab one from T-Mobile for $199.99.