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0 of 4 can be signed in to directly. These accounts don't need a password; an open one usually has no MFA and nobody watching it. Block sign-in in the Microsoft 365 admin centre (Users > Active users > the mailbox > Block sign-in). People keep their access.

Client	Mailbox	Type	Sign‑in allowed	Full access	Size
Contoso Legal LLP	accounts@contoso.example	Shared	Unknown	annabel.fraser@contoso.example, bobby.marsh@contoso.example + 4 more annabel.fraser@contoso.example bobby.marsh@contoso.example evie.davis@contoso.example jack.white@contoso.example jacob.johnson@contoso.example sam.carter@consultants.example	44.8 GB
Contoso Legal LLP	info@contoso.example	Shared	Unknown	annabel.fraser@contoso.example, jack.white@contoso.example + 2 more annabel.fraser@contoso.example jack.white@contoso.example noah.clark@contoso.example william.allen@contoso.example	6.4 GB
Contoso Legal LLP	reception@contoso.example	Shared	Unknown	annabel.fraser@contoso.example, ella.thomas@contoso.example + 2 more annabel.fraser@contoso.example ella.thomas@contoso.example joseph.morris@contoso.example priya.hughes@contoso.example	18.9 GB
Contoso Legal LLP	boardroom@contoso.example	Room	Unknown		102.4 MB
Fabrikam Dental Group	accounts@fabrikam.example	Shared	Unknown	amelia.khan@fabrikam.example, anna.kowalski@fabrikam.example + 4 more amelia.khan@fabrikam.example anna.kowalski@fabrikam.example ben.okafor@fabrikam.example henry.roberts@fabrikam.example owen.turner@fabrikam.example sam.carter@consultants.example	44.8 GB
Fabrikam Dental Group	info@fabrikam.example	Shared	Unknown	aisha.brown@fabrikam.example, anna.kowalski@fabrikam.example + 2 more aisha.brown@fabrikam.example anna.kowalski@fabrikam.example ava.jackson@fabrikam.example chloe.jackson@fabrikam.example	6.4 GB
Fabrikam Dental Group	reception@fabrikam.example	Shared	Unknown	aisha.brown@fabrikam.example, anna.kowalski@fabrikam.example + 2 more aisha.brown@fabrikam.example anna.kowalski@fabrikam.example leo.harrison@fabrikam.example owen.turner@fabrikam.example	18.9 GB
Fabrikam Dental Group	boardroom@fabrikam.example	Room	Unknown		102.4 MB
Northwind Traders	accounts@northwindtraders.example	Shared	Unknown	ann.patel@northwindtraders.example, grace.taylor@northwindtraders.example + 4 more ann.patel@northwindtraders.example grace.taylor@northwindtraders.example hannah.patel@northwindtraders.example leo.wright@northwindtraders.example robert.hughes@northwindtraders.example sam.carter@consultants.example	44.8 GB
Northwind Traders	info@northwindtraders.example	Shared	Unknown	alfie.roberts@northwindtraders.example, ann.patel@northwindtraders.example + 2 more alfie.roberts@northwindtraders.example ann.patel@northwindtraders.example harry.lee@northwindtraders.example isla.evans@northwindtraders.example	6.4 GB
Northwind Traders	reception@northwindtraders.example	Shared	Unknown	alfie.roberts@northwindtraders.example, ann.patel@northwindtraders.example + 2 more alfie.roberts@northwindtraders.example ann.patel@northwindtraders.example rhys.moore@northwindtraders.example ruby.hill@northwindtraders.example	18.9 GB
Northwind Traders	boardroom@northwindtraders.example	Room	Unknown		102.4 MB

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