Rickey Whitworth's Blog

Consider the following:

• We have an account named MYDOMAINmargie.murphy.

• This account has permissions on various SharePoint sites.

• This accounts NT Login Name changes to MYDOMAINmargie.richie for one of many
  different reasons (In our scenario, Margie married a really cool guy with the last
  name of Richie )

• The NT Login Name for this account was synchronized with Active Directory using the
  steps provided in my previous post Using
  SPUserUtil to update accounts when the NT Login Name changes

SharePoint provides a feature for users to use different Display Names and Email addresses
across the site collections they are members of.  This information is cached
in the tp_Title and tp_Email columns in the UserInfo table
for every site collection in which the user has permissions.  The individual
user can update their information or the administrator can do it by visiting the siteusrs.aspx page
for every site collection.  This allows a user to utilize say, different email
addresses for alerts on the same SharePoint Virtual Server but in different site collections. 
One scenario is where I may want to alert myself of changes to content on one site
collection using my work email address, while content from another site collection
should send alerts to my personal email address.

Source: Keith
Richie : Using SPUserUtil to synchronize SharePoint user Display Names and Email addresses
with the information in Active Directory

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