Blog address: https://blog.51cto.com/13969817
There are many IT companies have plans to migrate user mailboxes to Office 365 do centralized management, such as NetEase mailbox -> Exchange Online, such as Gmail-> Exchange Online, such as different Office 365 Tenant's Mailbox migration and so on, but in doing migration process because of lack of preliminary consideration, Mailbox size default 50GB new platform, less than the value stored in the old platform, there is no time to adjust before the migration, resulting in mailbox migration to fail, so we must do before the migration plan, such as with Office 365 Examples for different Office 365 plan, Mailbox is different from the default size, the reference table.
The default Office 365 mailbox message size is 25 MB, but the staff of some companies high-level message Size is much larger than 25MB, in doing mailbox migration, also need to be adjusted to advance Size 75MB, to avoid migration of storage space is super limited, and migration fails .
Then share how Mailbox Size adjustment by Windows PowerShell from 50GB to 100GB
1.连接 Exchange Online：
$Session = New-PSSession -ConfigurationName Microsoft.Exchange -ConnectionUri https://outlook.office365.com/powershell-liveid/ -Credential $UserCredential -Authentication Basic -AllowRedirection
2. Enter, enter Office 365 Global Admin user name and password:
3.导入Remote PowerShell Session
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There is a need for employees to set Mailbox Size, such as Byron's Mailbox size is 100 GB, send the Limit is 19 GB, Warning of Limitation: 18 GB
Set-Mailbox [email protected] -ProhibitSendQuota 99GB -ProhibitSendReceiveQuota 100GB -IssueWarningQuota 98GB
Check whether the settings have been updated
Get-Mailbox [email protected] | Select *quota 
More Description:
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All user settings Mailbox size enterprises: command:
the Get-Mailbox | -ProhibitSendQuota the Set-Mailbox <Value> -ProhibitSendReceiveQuota <Value> -IssueWarningQuota <Value> -
Users set up a department Mailbox size enterprises in order to:
Get-User | where {$_.Department -eq "Sales"} | Get-Mailbox | Set-Mailbox -ProhibitSendQuota < Value > -ProhibitSendReceiveQuota < Value > -IssueWarningQuota < Value >
- How to increase Mail Attachment Size employees
- More links: the Set-Mailbox , the Exchange Online Limits