Sir,
TEAM HERE we have previously worked on Salesforce but I need more details on your project as how many accounts/contacts to update with the addresses, how you will provide us with the address database, and what is your expected deadline etc.
Let's discuss more and finalize the project. We have our own workplace with 7+ working PCs and laptops, with ~10mbps internet connections. And we never out re-source our projects that we have taken from our clients :-)
Feel free to ask me questions, if any. I look forward to work with you.
You can also contact me through Skype. Have a good day and stay fine :-)
Sincere regards,
Jubair
eSolutions