To compare two users in a domain there are several settings that can affect how they function. If you have a working user and a failing user it is sometimes useful to compare some of these settings.
To extract all the information about a single user you can use ldifde from a command prompt.
ldifde -f Exportuser.ldf -d "dc=country,dc=corp,dc=company,dc=com" -p subtree -r "(&(objectCategory=person)(objectClass=User)(userPrincipalNamefirstname.lastname@example.org))"
-f Exportuser.ldf is the output file and can have any name you select.
-d this is your domain. If you open a command prompt and type "set", the environment variable USERDOMAIN are the entries for the dc=. Remember order is important.
userPrincipalName is you email address.
There are several layers of group policy from domain policies down to user policy. These policies are then added together to a resultant policy (RSOP). To retrieve these you can pipe the result from gpresult to a text file for both users.
gpresult /v > RSOP.txt
Dynamics CRM Team