Outlook – Duplicate emails in Sent Mail folder when sending from Outlook 2010 and using Google Apps

See this question:
How do I sync Gmail with Outlook 2010?

Unfortunately, there as some issues with Outlook 2010 and the Google Apps Sync tool. Hopefully they get that resolved soon (I'm also a Google Apps for EDU and Outlook 2010 user), but in the meantime you'll have to use the imap solution. Instructions for imap with Gmail can be found here:

http://mail.google.com/support/bin/answer.py?answer=77689

Those instructions are for Outlook 2007, but this at least is still pretty much the same for Outlook 2010.

To summarize the key points:

• First, don't forget to enable imap in gmail
• Your incoming mail server is imap.gmail.com on port 993 with SSL encryption
• Your outgoing mail server is smtp.gmail.com on port 587 with TLS encryption
• Your username is your full e-mail address. This is especially important for Google Apps for my domain users such as yourself.
• The smtp server uses the same authentication as the incoming server

Note that when you first tell it to use encryption on a server, it will set the default port for you. So if you enter the port first, make sure it didn't over-write your port selection.

Update
The Google Apps Sync tool now support Outlook 2010. If you have Google Apps Premier or Google Apps for Education, you can get it here:
https://tools.google.com/dlpage/gappssync

I re-listened to the video at https://tools.google.com/dlpage/gappssync and realized that the Google Apps Outlook Sync tool isn't meant for this. I wanted to keep working against Exchange and simply have my emails be synced to my google apps account. What the tool is doing is creating a new Outlook profile which points to your google apps account, then imports your emails et al from your original Exchange profile into this new profile, ie your data is now sitting in Google Apps. Once the import is done your content is re-downloaded from google apps back to your outlook client in the new profile. The video goes on to say that you can turn off Exchange and keep working with outlook against google apps. So Exchange is out of the picture.