Non AD users Exchange 2010 access client type

I have exchange server running on the head office and 4 braches  connecting to exchange server . issue is  some of benches  running workgroup except one  with the different domain . what is the best way to connect to exchange server 2010 from the client side . coz clients are not the AD users . I hope I can go with the outlook any ware ? which one is best POP3 , webmail or IMAP ?
All the branches connected via data IP VPN to head office  
curAsked:
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Elwin3Connect With a Mentor Commented:
Outlook anywhere would be best. see http://technet.microsoft.com/en-us/library/bb123741.aspxhope this helps.
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curAuthor Commented:
good
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