UPN and Exchange Email Address

Hi,
I have always followed the practice of creating a user account in AD and copying the format for the username as the email address in Exchange. for example, the UPN would be firstname.lastname and the email address would be [email protected]
However, in an environment I have taken over the AD names are quite often in a different format to the email such as; daveb and [email protected], or stevem and [email protected]
my question is - are there any foreseeable problems with having these differing formats between an AD name and an Exchange Email? to me it looks messy and confusing because there's varying formats used but from a technical perspective what issues might I
face, would we have any problems when, say, merging another AD into ours or migrating to Exchange Online? Personally I believe firstname.surname is a good standardized format to have, I'd appreciate your opinions.
Thanks
Steve

Hi Steve,
Regarding using different formats between UPN of AD user and Exchange Email, you may face OWA login issue. 
Checkout the below thread on OWN login issue due to different formats of AD users UPN and Exchange Email,
http://social.technet.microsoft.com/Forums/en-US/b2282e55-da01-4e79-b5ab-9e8ef1bd2fc5/owa-the-upn-and-email-address?forum=exchangesvrgenerallegacy
Regards,
Gopi
www.jijitechnologies.com

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