Are you using form-based authentication? Why not make your userPrincipalNames match the primary SMTP address?
(And just to note: In Exchange 2013, using the primary SMTP address is the default method using FBA.) From: Tom Miller [mailto:tmil...@sfgtrust.com] Sent: Tuesday, December 18, 2012 10:28 AM To: MS-Exchange Admin Issues Subject: Exchange 2010 logon OWA and ActiveSync questions Hi All, Our domain name and user IDs do not match our external smtp e-mail addresses. That seems to be confusing for our staff, since on the Outlook Web App they need to logon with their domain user ID. For those remote users who connect via the Outlook client using Outlook Anywhere method, they also need to enter their domain name and not the e-mail address. Is there any way Exchange can accommodate a logon via the smtp address? Thanks, Tom --- To manage subscriptions click here: http://lyris.sunbelt-software.com/read/my_forums/ or send an email to listmana...@lyris.sunbeltsoftware.com<mailto:listmana...@lyris.sunbeltsoftware.com> with the body: unsubscribe exchangelist --- To manage subscriptions click here: http://lyris.sunbelt-software.com/read/my_forums/ or send an email to listmana...@lyris.sunbeltsoftware.com with the body: unsubscribe exchangelist