A big +1 from me on this one. If there was a desktop app that had Gmail's good characteristics while still acting like a real desktop app… I'd be sold.
Just be careful with the google syncing. Google’s phone book has some quirks to keep in mind. Most specifically, all email addresses must be unique (so you can’t have two entries for a couple with a shared email). I also suspect there is a limit to the number of email adresses any one contact can have. I lost a chunk of data when I synced, and a backup on Google didn’t help since these restrictions were on their end.
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Just be careful with the google syncing. Google’s phone book has some quirks to keep in mind. Most specifically, all email addresses must be unique (so you can’t have two entries for a couple with a shared email). I also suspect there is a limit to the number of email adresses any one contact can have. I lost a chunk of data when I synced, and a backup on Google didn’t help since these restrictions were on their end.