You can only have one instance of Outlook using the same .pst file open at a time. Each time you want someone else to use it, you must COMPLETELY close Outlook and restart with a new profile.

--�
Milly Staples [MVP - Outlook]

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After furious head scratching, gb asked:

| I work in a school where the teacher has her kids use her account to
| email another class. After opening Outlook 2003 about 10 times it
| stops working. She has roughly 20 kids in her class. Is there a way
| to up the number of times a user can have outlook open at one time?