Had some trouble recently getting clients setup with Microsoft Exchange Online services on a mobile device. Here’s the settings that worked for me.
IPhone
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Email: [email protected]
Server: red001.mail.microsoftonline.com (Do no included the HTTPS:\ portion of address)
Domain: Should be left blank
Username: [email protected]
Password: ******** (The users BPOS/Exchange Online password)
Blackberry
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Email account: [email protected]
Web Access URL: https://red001.mail.microsoftonline.com/owa (be sure to include the https:// and trailing /owa)
Username: [email protected]
Password: ******** (The users BPOS/Exchange Online password)
Mailbox Name: user (just the prefix of their email address)