Composite SSO Scenario

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Hi,

We're implementing NW 7.0 SPS13 for an Intranet Portal Scenario. For this, we'll need the following SSO's:

- SPNEGO (Windows Integrated Authentication)

- Sharepoint Server SSO

- Outlook Web Access (OWA) SSO

- SAP R/3 and BI SSO

Here is the problem:

- Users UserIDs for Domain, Sharepoint and Outlook is : <name>.<surname>

eg. john.doe

- Users UserIDs for SAP R/3 and BI is: <first_letter_of_name><surname>

eg. jdoe

It is possible to use an attribute on Active Directory as username (e.g. postofficebox) and authenticate user to portal with that attribute. This solves the SSO for OWA, R/3, BI and Sharepoint.

But I'm not sure how to authenticate a user to portal as jdoe who logges on to the Domain with john.doe.

Is this possible. If possible then I'm able to solve the whole SSO requirements.

Regards...